公式法(a+2b)^2-c^2(x^2-3)^2-369/25-(x-y)^2(x+y)^2-(x-z)^2(3a+2b)^2-4(a-b)^29(x+y)^2-4(x-y)^216(2m+n)^2-9(m-2n)^2(x^2-y^2)-(x-y)3a(a+b)^-75ab^2赏20

Question

公式法 (a+2b)^2-c^2 (x^2-3)^2-36 9/25-(x-y)^2 (x+y)^2-(x-z)^2 (3a+2b)^2-4(a-b)^2 9(x+y)^2-4(x-y)^2
16(2m+n)^2-9(m-2n)^2
(x^2-y^2)-(x-y)
3a(a+b)^-75ab^2
赏20

Answer 1

16(2m+n)^2-9(m-2n)^2
=【4*（2M+N）】^2-【3(M-2N)】^2
=【4*（2M+N）+3(M-2N)】*【4*（2M+N）-3(M-2N)】
=（11M-2N）*(5M+10N)
=2*（11M-2N）*(M+2N)
x^2-y^2)-(x-y)=【（X+Y）*（X-Y）】*(X-Y)=(X-Y)(X+Y-1)