1/4x+390=3/7x

43dz2022-10-04 11:39:543条回答

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真怪 共回答了16个问题 | 采纳率93.8%
1/4x+390=3/7x 移项得3x/7-x/4=390 合并得:(3/7-1/4)x=390 5x/28=390 x=390÷5/28 x=2184
1年前
liletian210 共回答了13个问题 | 采纳率84.6%
1/4x+390=3/7x 3/7x -1/4x=390 (3/7-1/4)x=390 5/28x=390 x=2184
1年前
超级牛人 共回答了12个问题 | 采纳率75%
1/4x+390=3/7x 390=3/7x-1/4x 390=12/28x-7/28x 390=5/28x (两边同乘以28) 10920=5x x=2184
1年前

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570*X+390*Y=19102
570*X+390*Y=19102
要求X,Y是不超过2位小数点的数字,整数也可以不过肯定算不出来.无论是整2位小数还是保留到2位小数都可以.但是结果算出来必须是19102,不是四舍五入,而是得出的数字就是19102另外XY,是我产品的重量,请相差不能太大,0到10以内的都不太现实.
gigi198419841年前2
cat3dog1 共回答了17个问题 | 采纳率88.2%
借助EXCEL,可以很容易得出X和Y的对应值,下列数据是期中的一部分,由于解答有字数的限制,不能全部发上来,但可以告诉你,X和Y中至少有一个>10的情形中不存在恰好是两位或小于两位小数的对应值.(下列的X是精确值,Y是由对应的X得出的近似值)
x=10.01,y=34.349
x=10.02,y=34.335
x=10.03,y=34.320
x=10.04,y=34.306
x=10.05,y=34.291
x=10.06,y=34.276
x=10.07,y=34.262
x=10.08,y=34.247
x=10.09,y=34.233
x=10.1,y=34.218
x=10.11,y=34.203
x=10.12,y=34.189
x=10.13,y=34.174
x=10.14,y=34.159
x=10.15,y=34.145
x=10.16,y=34.130
x=10.17,y=34.116
x=10.18,y=34.101
x=10.19,y=34.086
x=10.2,y=34.072
x=10.21,y=34.057
x=10.22,y=34.043
x=10.23,y=34.028
x=10.24,y=34.013
x=10.25,y=33.999
x=10.26,y=33.984
x=10.27,y=33.969
x=10.28,y=33.955
x=10.29,y=33.940
x=10.3,y=33.926
x=10.31,y=33.911
x=10.32,y=33.896
x=10.33,y=33.882
x=10.34,y=33.867
x=10.35,y=33.853
x=10.36,y=33.838
x=10.37,y=33.823
x=10.38,y=33.809
x=10.39,y=33.794
x=10.4,y=33.779
x=10.41,y=33.765
x=10.42,y=33.750
x=10.43,y=33.736
x=10.44,y=33.721
x=10.45,y=33.706
x=10.46,y=33.692
x=10.47,y=33.677
x=10.48,y=33.663
x=10.49,y=33.648
x=10.5,y=33.633
x=10.51,y=33.619
x=10.52,y=33.604
x=10.53,y=33.589
x=10.54,y=33.575
x=10.55,y=33.560
x=10.56,y=33.546
x=10.57,y=33.531
x=10.58,y=33.516
x=10.59,y=33.502
x=10.6,y=33.487
x=10.61,y=33.473
x=10.62,y=33.458
x=10.63,y=33.443
x=10.64,y=33.429
x=10.65,y=33.414
x=10.66,y=33.399
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x=10.73,y=33.297
x=10.74,y=33.283
x=10.75,y=33.268
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x=10.95,y=32.976
x=10.96,y=32.961
x=10.97,y=32.946
x=10.98,y=32.932
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x=11.01,y=32.888
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x=13.91,y=28.649
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x=13.93,y=28.620
x=13.94,y=28.606
x=13.95,y=28.591
x=13.96,y=28.576
x=13.97,y=28.562
x=13.98,y=28.547
x=13.99,y=28.533
x=14,y=28.518
x=14.01,y=28.503
x=14.02,y=28.489
x=14.03,y=28.474
x=14.04,y=28.459
x=14.05,y=28.445
x=14.06,y=28.430
x=14.07,y=28.416
x=14.08,y=28.401
x=14.09,y=28.386
x=14.1,y=28.372
x=14.11,y=28.357
x=14.12,y=28.343
x=14.13,y=28.328
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x=14.16,y=28.284
x=14.17,y=28.269
x=14.18,y=28.255
x=14.19,y=28.240
x=14.2,y=28.226
x=14.21,y=28.211
x=14.22,y=28.196
x=14.23,y=28.182
x=14.24,y=28.167
x=14.25,y=28.153
x=14.26,y=28.138
x=14.27,y=28.123
x=14.28,y=28.109
x=14.29,y=28.094
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x=14.31,y=28.065
x=14.32,y=28.050
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x=14.38,y=27.963
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x=14.44,y=27.875
x=14.45,y=27.860
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x=14.48,y=27.816
x=14.49,y=27.802
x=14.5,y=27.787
x=14.51,y=27.773
x=14.52,y=27.758
x=14.53,y=27.743
x=14.54,y=27.729
x=14.55,y=27.714
x=14.56,y=27.699
x=14.57,y=27.685
x=14.58,y=27.670
x=14.59,y=27.656
x=14.6,y=27.641
x=14.61,y=27.626
x=14.62,y=27.612
x=14.63,y=27.597
x=14.64,y=27.583
x=14.65,y=27.568
x=14.66,y=27.553
x=14.67,y=27.539
x=14.68,y=27.524
x=14.69,y=27.509
x=14.7,y=27.495
x=14.71,y=27.480
x=14.72,y=27.466
x=14.73,y=27.451
x=14.74,y=27.436
x=14.75,y=27.422
x=14.76,y=27.407
x=14.77,y=27.393
x=14.78,y=27.378
x=14.79,y=27.363
x=14.8,y=27.349
x=14.81,y=27.334
x=14.82,y=27.319
x=14.83,y=27.305
.
江苏吴云超解答 供参考!
0.5-0.2= 0.3+0.5= 390÷3= 20×5= 560÷4= 24×50= 60×60= 800÷5= 2
0.5-0.2= 0.3+0.5= 390÷3= 20×5=
560÷4= 24×50= 60×60= 800÷5=
23×10= 0×38= 120×2= 40×80=
57÷3= 80×7= 0÷23= 11×60=
820÷2= 1.9+1.1= 2.3-0.3= 9.5+0.5=
1.2-0.8= 0.6+0.9= 2.0-1.4= 5.7-0.7=
3×9+13= 50-200÷4= 20×9÷3= 28÷7×6=
NAAO1年前1
发现ll 共回答了21个问题 | 采纳率95.2%
0.3;0.8;130;100;140;1200;1200;160;
230;0;240;3200;19;560;0;660;
410;3;2;10;0.4;1.5;0.6;5;40;0;60;24
450+390÷130-123
风如林1年前5
112e 共回答了2个问题 | 采纳率50%
330
390-190= 23+16= 25×4= 0.12×3= 0.4×0.2= 28÷28= 0.24÷2= 1÷5= 9
390-190= 23+16= 25×4= 0.12×3= 0.4×0.2=
28÷28= 0.24÷2= 1÷5= 9÷100= 7÷6=
100-94= 1.7+2.3= +[2/3]= [1/4]+[1/5]= [1/2]-[1/6]=
4×[5/6]= [3/4]×[2/9]= [3/4]÷[3/5]= 1-[2/9]= [6/7]÷3=
毫无疑问20031年前1
siot 共回答了16个问题 | 采纳率87.5%
390-190=200, 23+16=39, 25×4=100, 0.12×3=0.36, 0.4×0.2=0.08,
28÷28=1, 0.24÷2=0.12, 1÷5=0.2, 9÷100=0.09, 7÷6=[7/6],
100-94=6, 1.7+2.3=4, [1/3]+[2/3]=1, [1/4]+[1/5]=[9/20], [1/2]-[1/6]=[1/3],
4×[5/6]=[10/3], [3/4]×[2/9]=[1/6], [3/4]÷[3/5]=[5/4], 1-[2/9]=[7/9], [6/7]÷3=[2/7].
450+360 720-390 423-299 800×125 300÷15 547+398 16×50 58×5×2
450+360 720-390 423-299
800×125 300÷15 547+398
16×50 58×5×2 921-123-77
(37+43)÷40 720÷8÷9 24-24÷24+24.
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解题思路:423-299,547+398根据凑整法简算;
58×5×2根据乘法结合律简算;
921-123-77根据减法的性质简算;
其它题目根据运算法则和运算顺序直接求解.

450+360=810 720-390=330 423-299=124
800×125=100000 300÷15=20 547+398=945
16×50=800 58×5×2=580 921-123-77=721
(37+43)÷40=2 720÷8÷9=10 24-24÷24+24=47.

点评:
本题考点: 整数四则混合运算;整数的加法和减法;整数的乘法及应用.

考点点评: 本题考查了简单的运算,要注意根据运算法则和运算定律快速准确的得出答案.

550-80= 0÷77= 960÷60= 390+410= 700÷50= 0+890= 0×199= 400×20=
550-80= 0÷77= 960÷60= 390+410= 700÷50=
0+890= 0×199= 400×20= 780-780= 330×40=
903+407= 300÷300= 550÷10= 1000-450= 440×30=
650÷50= 120×70= 60×210=
kissthesnow1年前1
zhgf 共回答了20个问题 | 采纳率85%
解题思路:根据整数的四则运算的计算法则进行计算即可求解.

550-80=470 0÷77=0 960÷60=16 390+410=800 700÷50=14
0+890=890 0×199=0 400×20=8000 780-780=0 330×40=13200
903+407=1310 300÷300=1 550÷10=55 1000-450=550 440×30=13200
650÷50=13 120×70=8400 60×210=12600

点评:
本题考点: 整数的加法和减法;整数的乘法及应用;整数的除法及应用.

考点点评: 考查了整数的四则运算,关键是熟练掌握计算法则,正确进行计算.

2.005×390-20.05×41+200.5×2
mick19361年前1
zsslang 共回答了23个问题 | 采纳率91.3%
2.005×390-20.05×41+200.5×2
=20.05x39-20.05x41+20.05x20
=20.05x(39-41+20)
=20.05x18
=20.05x(10+8)
=20.05x10+20.05x8
=200.5+160.4
=360.9
2.005×390+20.05×41+200.5×2=______.
平_zz1年前4
枯井7980 共回答了23个问题 | 采纳率78.3%
解题思路:根据因数中的小数位数等于积中的小数位数,变化出相同的因数来,利用乘法分配律的逆运算.

2.005×390+20.05×41+200.5×2
=20.05×39+20.05×41+20.05×20
=20.05×(39+41+20)
=20.05×100
=2005.

点评:
本题考点: 运算定律与简便运算.

考点点评: 两个因数中的小数位数等于积中的小数位数,经过变化巧用乘法分配律.

1/4x+390=3/7x 3Q
迷迷了了1年前1
BeUrPet 共回答了17个问题 | 采纳率88.2%
1/4x+390=3/7x 390=3/7x-1/4x 390=12/28x-7/28x 390=5/28x (两边同乘以28) 10920=5x x=2184
550-80= 0÷77= 960÷60= 390+410= 700÷50= 0+890= 0×199= 400×20=
550-80= 0÷77= 960÷60= 390+410= 700÷50=
0+890= 0×199= 400×20= 780-780= 330×40=
903+407= 300÷300= 550÷10= 1000-450= 440×30=
650÷50= 120×70= 60×210=
折翅的小天使1年前1
nini_307 共回答了15个问题 | 采纳率80%
550-80=470 0÷77=0 960÷60=16 390+410=800 700÷50=14 0+890=890 0×199=0 400×20=8000 780-780=0 330×40=13200 903+407=1310 300÷300=1 550÷10=55 1000-450=550 440×30=13200 ...
1/4x+390=3/7x
cuiyueyuan1年前3
冷冻爱 共回答了13个问题 | 采纳率84.6%
1/4x+390=3/7x 390=3/7x-1/4x 390=12/28x-7/28x 390=5/28x (两边同乘以28) 10920=5x x=2184