1.(3X-Y)(X+2Y) =3x*x+6xy-xy-2y*y=3x*x+5xy-2y*y
2.-2(a-2b)(3a+b)=-2(3a*a-ab+6ab-2b*b)= -6a*a-10ab+4b*b
3.3(X-2/1)(x+3/1)=3(x*x+3x-2x-6)=3x*x+3x-18
4.(a-2)(a-3)-(a-1)(a-4)=a*a-5a+6-(a*a-5a+4)=10
多项式乘法,1.(3X-Y)(X+2Y) 2.-2(a-2b)(3a+b) 3.3(X-2/1)(x+3/1)4.(a-
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