①25x²-36=(5x+6)(5x-6②64-16a²=16(4-a^2)=16(2+a)(2-a)③0.49x²-0.04y²=(0.7x+0.2y)(0.7x-0.2y)④-4a²b²+4ab-1=-(4a²b²-4ab+1)=-(2ab+1)^2⑤(m-n)³+2n（n-m）²⑥1/2a²b+2a²b²+2ab³⑦已知a+b=-2,ab=-5/2.求a(a+b)(a-b)-a(a+b)²⑤(m-n)³+2n（n-m）²=(m-n)³+2n（m-n）²=(m-n)^2)(m-n+2n)=(m-n)^2(m+n)⑥1/2a²b+2a²b²+2ab³=1/2ab(a+4ab+4b^2)⑦已知a+b=-2,ab=-5/2.求a(a+b)(a-b)-a(a+b)²a(a+b)(a-b)-a(a+b)²=a(a+b)(a-b-a-b)=-2ab(a+b)=-2*(-5/2)*(-2)=-10