初中数学题整式的加减,(1)(3x+1)(x-2) (2)(x-8y)(x-y)(3)(x+y)² (4)(x+y)(x²y^4+y²) (5)(x-1)(x²+x+1)

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初中数学题整式的加减,(1)(3x+1)(x-2) (2)(x-8y)(x-y)(3)(x+y)² (4)(x+y)(x²y^4+y²) (5)(x-1)(x²+x+1)
初中数学题整式的加减,(1)(3x+1)(x-2) (2)(x-8y)(x-y)
(3)(x+y)² (4)(x+y)(x²y^4+y²) (5)(x-1)(x²+x+1)

初中数学题整式的加减,(1)(3x+1)(x-2) (2)(x-8y)(x-y)(3)(x+y)² (4)(x+y)(x²y^4+y²) (5)(x-1)(x²+x+1)
1)原式=3x²-6x+x-2=3x²-5x-2
2)原式=x²-xy-8xy+8y²=x²-9xy+8y²
3)原式=x²+2xy+y²
4)原式=x³y^4+xy²+x²y^5+y³
5)原式=x³+x²+x-x²-x-1=x³+x-1