Question

m(x-y)^2 -(x-y)9(a-b)^2-16(a+b)^23x^2 -12x^2y + 6xy^2若a+b=5,

Answer 1

1,(x-y)(mx-my-1)

2,-(7a+b)(a+7b)

3,3x(x-4xy+2y^2)

4,a^2+b^2=(a+b)^2-2ab=17

5,8^m *4^n=2^3m*2^2n=2^(3m+2n)=2^3=8

6,3^x+1*2^2x+1=6^2x-3题目不正确