计算1.m的3次方/(-m²)m 2.(2a+1)(a-3)2(a+1)(a-1)

问题描述:

计算1.m的3次方/(-m²)m 2.(2a+1)(a-3)2(a+1)(a-1)
3.(a-b+2)(a+b-2) 4.(x-1)(x+6)-(x+1)²
因式分解 1.2x(a-b)-a+b 2.(a²+b²)²-4a²b² 3.2x²-x+1/8

1. m^3/(-m^2)m=m^3/(-m^3)=-12. (2a+1)(a-3)=2a^2-6a+a-3=2a^2-5a-3 2(a+1)(a-1)=2(a^2-1)=2a^2-23. (a-b+2)(a+b-2)=[a+(2-b)][a-(2-b)]=a^2-(2-b)^2=a^2-(b^2-2b+4)=a^2-b^2+2b-44. (x-1)(x+6)-(x+1)^2=x^2+5x-6-(...