作业帮1.(2x-3)(x-2)-2(x-1)^2 2.【（xy+2)(xy-2)-2x^2y^2+4]/xy3.8x^6-6x^6+12x^5+6x^4 4.(x+2)(y-3)-(x-1)(y+2) 5.(a-6)(a^2+b^2)(a+b) 6.(x+2y)^2(x-2y)^2 7.(a-2b+3c)(a-2b-3c)
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/08 04:09:05
![1.(2x-3)(x-2)-2(x-1)^2 2.【（xy+2)(xy-2)-2x^2y^2+4]/xy3.8x^6-6x^6+12x^5+6x^4 4.(x+2)(y-3)-(x-1)(y+2) 5.(a-6)(a^2+b^2)(a+b) 6.(x+2y)^2(x-2y)^2 7.(a-2b+3c)(a-2b-3c)](/uploads/image/z/5184554-50-4.jpg?t=1.%282x-3%29%28x-2%29-2%28x-1%29%5E2+2.%E3%80%90%EF%BC%88xy%2B2%29%28xy-2%29-2x%5E2y%5E2%2B4%5D%2Fxy3.8x%5E6-6x%5E6%2B12x%5E5%2B6x%5E4+4.%28x%2B2%29%28y-3%29-%28x-1%29%28y%2B2%29+5.%28a-6%29%28a%5E2%2Bb%5E2%29%28a%2Bb%29+6.%28x%2B2y%29%5E2%28x-2y%29%5E2+7.%28a-2b%2B3c%29%28a-2b-3c%29)
1.(2x-3)(x-2)-2(x-1)^2 2.【（xy+2)(xy-2)-2x^2y^2+4]/xy3.8x^6-6x^6+12x^5+6x^4 4.(x+2)(y-3)-(x-1)(y+2) 5.(a-6)(a^2+b^2)(a+b) 6.(x+2y)^2(x-2y)^2 7.(a-2b+3c)(a-2b-3c)
1.(2x-3)(x-2)-2(x-1)^2 2.【（xy+2)(xy-2)-2x^2y^2+4]/xy
3.8x^6-6x^6+12x^5+6x^4 4.(x+2)(y-3)-(x-1)(y+2) 5.(a-6)(a^2+b^2)(a+b) 6.(x+2y)^2(x-2y)^2 7.(a-2b+3c)(a-2b-3c)
1.(2x-3)(x-2)-2(x-1)^2 2.【（xy+2)(xy-2)-2x^2y^2+4]/xy3.8x^6-6x^6+12x^5+6x^4 4.(x+2)(y-3)-(x-1)(y+2) 5.(a-6)(a^2+b^2)(a+b) 6.(x+2y)^2(x-2y)^2 7.(a-2b+3c)(a-2b-3c)
1.(2x-3)(x-2)-2(x-1)^2
原式=2x²-7x+6-2x²+4x-2
=-3x+4
2.[（xy+2)(xy-2)-2x^2y^2+4]/xy
原式=[-x²y²]／xy
=-xy
3.8x^6-6x^6+12x^5+6x^4
原式=2x^4（x²+6x+3）
4.(x+2)(y-3)-(x-1)(y+2)
原式=xy-3x+2y-6-xy-2x+y+2
=-5x+3y-4
5.(a-6)(a^2+b^2)(a+b)
原式=（ab²-5a²-6b²）（a+b）
=a²b²+ab³-5a³-5a²b -6ab²-6b³
6.(x+2y)^2(x-2y)^2
原式=.(x²+4xy+4y²)(x²-4xy+4y²)
=x^4-4x³y+4x²y²+4x³y-16x²y²+16xy³+4x²y²-16xy³+16y^4
=x^4-8x²y²+16y^4
7.(a-2b+3c)(a-2b-3c)
原式=[(a-2b）+3c][(a-2b）-3c]
=(a-2b）²-（3c）²
=a²-4ab+4b²-9c²