0.123+0.321+0.234+0.432+0.345+0.543+……+0.789+0.987=?

希望是三月2022-10-04 11:39:546条回答

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孔大雀共回答了19个问题 | 采纳率84.2%: 十分位：
0.1+0.3 = 0.4
0.2+0.4 = 0.6
0.3+0.5 = 0.8
...
0.7+0.9 = 1.6
求和=7
千分位情况类似,求和=0.07
百分位：
0.02*2+0.03*2+...+0.08*2=0.7
所以结果7.77; 1年前

令狐玮共回答了188个问题 | 采纳率: 0.123+0.321+0.234+0.432+0.345+0.543+……+0.789+0.987=（0.123+0.987）+（0.321
0.789）+……共7项
＝1.11×7
＝7.77; 1年前

jojonew 共回答了7962个问题 | 采纳率: 0.123+0.321+0.234+0.432+0.345+0.543+……+0.789+0.987
=0.111×（1+2+3+……+9）
=0.111×（1+9）×10/2
=0.111×45
=4.995; 1年前

whitesharke 共回答了28个问题 | 采纳率: 总共14项，第k个和倒数第k个相加等于1.11，总共7.77。
吐槽一下一楼，这题也好意思要分。。。; 1年前

(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.2 (100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)等于多少 shiyu19971年前5: 啐你丫的共回答了27个问题 | 采纳率88.9%

(100+0.123+0.245+8.9)x(0.123+0.245+8.9+12.71)-(100+0.123+0.245+8.9+12.71)x(0.123+0.245+8.9)
=(100+0.123+0.245+8.9)x(0.123+0.245+8.9）+(100+0.123+0.245+8.9)x12.71-(100+0.123+0.245+8.9)x(0.123+0.245+8.9)-12.71x(0.123+0.245+8.9)
=(100+0.123+0.245+8.9)x12.71-12.71x(0.123+0.245+8.9)
=【(100+0.123+0.245+8.9)-（0.123+0.245+8.9)】x12.71
=【100+0.123+0.245+8.9-0.123-0.245-8.9】x12.71
=100x12.71
=1271

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0.123+0.234+0.345+.+0.789 sd70288571年前1: fsy1996 共回答了15个问题 | 采纳率100%

=0.1+0.2+0.3+...+0.7+0.02+0.03+...+0.08+
0.003+0.004+...+0.009
=2.8+0.35+0.042
=3.192

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12\11+7\22+12\37+(7\41-0.123) 1211+722+1237+(741-0.123) ""是分之的意思 1211就是十二分之十一 baobao_xiao1年前1: zw8cool 共回答了23个问题 | 采纳率95.7%

=12(11+37)+7(22+41)-0.123
=4+9-0.123
=12.877

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1.23*45.6*0.789/4.56/7.89/0.123 1.23*45.6*0.789/4.56/7.89/0.123 要有运算过程 clllll1年前1: 瘦四眼共回答了15个问题 | 采纳率86.7%

根据乘除法的交换和分配率
原式=(1.23/0.123)*(45.6/4.56)*(0.789/7.89)
=10*10*0.1
=10
你三岁孩子啊

1年前查看全部

﹙1+0.112+0.123﹚×﹙0.112+0.123+0.134﹚-﹙1+0.112+0.123+0.134﹚×﹙0 ﹙1+0.112+0.123﹚×﹙0.112+0.123+0.134﹚-﹙1+0.112+0.123+0.134﹚×﹙0.112+0.123﹚简便计算 请顺便讲讲道理吧! 昨天昨夜1年前1: Forrst 共回答了19个问题 | 采纳率100%

设 0.112+0.123=a
原式=﹙1+a﹚×﹙a+0.134﹚-﹙1+a+0.134﹚×a
=a+a²+0.134a+0.134 - (a+a²+0.134a)
=0.134

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（0.125+0.234+0.345）×（0.234+0.345+0.456）减（0.123+0.234+0.345+0 （0.125+0.234+0.345）×（0.234+0.345+0.456）减（0.123+0.234+0.345+0.456）×（0.234+0.345） running_the_boy1年前1: 云5460 共回答了13个问题 | 采纳率84.6%

设0.123+0.234+0.345=a,0.234+0.345=b
a-b=(0.123+0.234+0.345)-(0.234+0.345)=0.123
则原式=a×(b+0.456)-(a+0.456)×b
=ab+0.456a-ab-0.456b
=0.456a-0.456b
=0.456(a-b)
=0.456×0.123
=0.056088

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4（X-0.123）+7（Y+3.45）=1于5(x-0.123)-(y+3.45)=11同解,求X,Y 裤子1701年前1: lindachz 共回答了16个问题 | 采纳率100%

4（X-0.123）+7（Y+3.45）=1于5(x-0.123)-(y+3.45)=11同解
就是解方程组
4（X-0.123）+7（Y+3.45）=1
5(x-0.123)-(y+3.45)=11
解得
x=2.123
y=-4.45

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