1(1) =(a-1)(7+x)
(2) =(a-b)[3(a-b)-6]=3(a-b)(a-b-2)
(3) =(m-n)[2(m-n)-m]=(m-n)(m-2n)
(4) =(x-y)²(x-y)=(x-y)³
(5) =(a²+b²)(m+n)
(6) =(a-b)²[18(a-b)-12b]=6(3a-5b)(a-b)²
(7) =(2a+b)(2a-3b-3a)=-(2a+b)(a+3b)
(8) =x(x+y)[x-y-(x+y)]=x(x+y)(-2y)=-2xy(x+y)
2(1) =x(m-2)=1.5(6-2)=6
(2) =(a-2)(a-2+6)=(a-2)(a+4)=(-2-2)(-2+4)=-8
1(1) =(a+9)(a-9)
(2) =(6+x)(6-x)
(3) =(1+4b)(1-4b)
(4) =(m+3n)(m-3n)
(5) =(0.5q+11p)(0.5q-11p)
(6) =(13x+2y)(13x-2y)
(7) =(3ap+bq)(3ap-bq)
(8) =(3.5a+xy)(3.5a-xy)
2(1) =(m+n+n)(m+n-n)=m(m+2n)
(2) =[7(a-b)+4(a+b)][7(a-b)-4(a+b)]=(11a-3b)(3a-11b)
(3) =[(2x+y)+(x+2y)][(2x+y)-(x+2y)]=(3x+3y)(x-y)=3(x+y)(x-y)
(4) =(x²+y²+xy)(x²+y²-xy)
(5) =3a(x²-y⁴)=3a(x+y²)(x-y²)
(6) =(p²+1)(p²-1)=(p²+1)(p+1)(p-1)
再问： 还有呢
再答： 四题，都有了啊
再问： 谢了
