1.5a+(2-4a)=02.2(x+8)=3(x-1)23.2x- -x+2=-x+334.3(3x+5)=2(2x-

静思缘来2022-10-04 11:39:541条回答

1.5a+(2-4a)=0
2.2(x+8)=3(x-1)
2
3.2x- -x+2=-x+3
3
4.3(3x+5)=2(2x-1)
5.3(3y-1)-12=2(5y-7)

已提交,审核后显示!提交回复

共1条回复
niuzai0628 共回答了19个问题 | 采纳率84.2%
1.5a+(2-4a)=0 1.5a+2-4a=0 1.5a-4a=-2 -2.5a=-2 a=2除以2.5
1年前

相关推荐

(4x-3y)²和(1.5a-2/3B)²
(4x-3y)²和(1.5a-2/3B)²
第一个等于16x²-24xy-9y²还是16x²-24xy+9y²?写清一步一步的解题过程!该加括号的加括号
男左女右部落1年前2
yangbaowangkun 共回答了23个问题 | 采纳率91.3%
遇到这种,你就只认这个公式:(a+b)^2=a^2+b^2+2*a*b.
(4x-3y)^2中a=4x,b=-3y,代进去后就得到结果了.
(1)(4x-3y)^2 (2)(1.5a-2/3b)^2 (3)(25x^3+15^2-20x)÷(-5x) (4)(
(1)(4x-3y)^2 (2)(1.5a-2/3b)^2 (3)(25x^3+15^2-20x)÷(-5x) (4)(2/5y^3-7y^2+2/3y)÷2/3y
(5)(8a^3b-5a^2b^2)÷4ab (6)(2a)^3×b^4÷12a^3b^2 (7)(6/5a^3x^4-0.9ax^3)÷3/5ax^3
越快越好,
yoyoliujia1年前3
爱上飞舞的猪 共回答了18个问题 | 采纳率88.9%
(1)(4x-3y)^2 =(4x)²-2×4x×3y+(3y)²=16x²-24xy+9y²

(2)(1.5a-2/3b)^2=2.25a²-2ab+4b²/9

(3)(25x^3+15x^2-20x)÷(-5x)
=25x^3÷(-5x) +15x^2÷(-5x) -20x ÷(-5x)
=-5x²-3x+4

(4)(2/5y^3-7y^2+2/3y)÷2/3y
=2/5y^3÷2/3y-7y^2÷2/3y+2/3y ÷2/3y
=3y²/5-21y/2+1

(5)(8a^3b-5a^2b^2)÷4ab
=8a^3b÷4ab -5a^2b^2 ÷4ab
=2a²-5ab/4

(6)(2a)^3×b^4÷12a^3b^2
=8a³b^4÷12a³b²
=2b²/3

(7)(6/5a^3x^4-0.9ax^3)÷3/5ax^3
=6/5a^3x^4÷3/5ax^3-0.9ax^3 ÷3/5ax^3
=2a²x-1.5
1.5a(m-n)-10a(m-n)
1.5a(m-n)-10a(m-n)
2.(x+y)²(x-y)+(x+y)(x-y)²
3.x²y²-0.04
4.-m²+1/16
5.9a²-12a+4
6.4x²+20xy+25y²
7.x²+7x+12
8.x²-4xy-96y²
小小七星1年前4
tttt 共回答了19个问题 | 采纳率89.5%
1.5a(m-n)-10a(m-n)
=-5a(m-n)
2.(x+y)²(x-y)+(x+y)(x-y)²
=(x+y)(x-y)(x+y+x-y)
=2x(x+y)(x-y)
3.x²y²-0.04
=(xy+0.2)(xy-0.2) (平方差)
4.-m²+1/16
=-(m+1/4)(m-1/4) (平方差)
5.9a²-12a+4
=(3a-2)^2 (完全平方)
6.4x²+20xy+25y²
=(2x+5y)^2 (完全平方)
7.x²+7x+12
=(x+3)(x+4) (交叉相乘)
8.x²-4xy-96y²
=(x+8y)(x-12y) (交叉相乘)
4b-1.5a=400,5.5a-8b=4200,
快乐痞子钟1年前2
shirley316 共回答了17个问题 | 采纳率94.1%
4b-1.5a=400
b=(1.5a+400)/4
代入5.5a-8b=4200
5.5a-3a-800=4200
2.5a=5000
所以
a=2000
b=(1.5a+400)/4=850
若Ia-2I +(b+3)²=0,求3a²b - 【2ab²-2(ab-1.5a²
若Ia-2I +(b+3)²=0,求3a²b - 【2ab²-2(ab-1.5a²b)+ab】+3ab²
我是义肢1年前3
青涩--柠檬 共回答了20个问题 | 采纳率90%
∵Ia-2I +(b+3)²=0,
∴Ia-2I =0,(b+3)²=0,
a-2=0,b+3=0
∴a=2,b=-3.
3a²b - 【2ab²-2(ab-1.5a²b)+ab】+3ab²
=3a²b - (2ab²-2ab+3a²b+ab)+3ab²
=3a²b - 2ab²+2ab-3a²b-ab+3ab²
=ab²+ab
=2×(-3)²+2×(-3)
=18-6
=12
1.5a+3[2b-3(a-b+2c)-(b+c)] 2.4x²-[2x-(x²-2x+3)-2(x
1.5a+3[2b-3(a-b+2c)-(b+c)] 2.4x²-[2x-(x²-2x+3)-2(x²-3x)]
aaa555yyy1年前1
uuttiqq 共回答了16个问题 | 采纳率81.3%
5a+3[2b-3(a-b+2c)-(b+c)]
=5a+3(2b-3a+3b-6c-b-c)
=5a+6b-9a+9b-18c-3b-3c
=(5a-9a)+(6b+9b-3b)-(18c+3c)
=-4a+12b-21c

4x²-[2x-(x²-2x+3)-2(x²-3x)]
=4x²-(2x-x²+2x-3-2x²+6x)
=4x²-2x+x²-2x+3+2x²-6x
=(4x²+x²+2x²)-(2x+2x+6x)+3
=7x²-10x+3