挺多的.求一一回答.1[A+B][X+Y]-[B+A][Y-X]144[A-B]^2-225]A+B]^2A^2B^2+4-4ABXY^2-4X^2-十六分之一Y^4[M^2+2m]^2-2m+4n^2]^2上面都是因式分解.下面是简便73×145^2-105^2×731000^2下面是计算[2X-Y][X^2+XY-2Y^2]2005^2-2004×2006
问题描述:
挺多的.求一一回答.1
[A+B][X+Y]-[B+A][Y-X]
144[A-B]^2-225]A+B]^2
A^2B^2+4-4AB
XY^2-4X^2-十六分之一Y^4
[M^2+2m]^2-2m+4n^2]^2
上面都是因式分解.下面是简便
73×145^2-105^2×73
1000^2
下面是计算
[2X-Y][X^2+XY-2Y^2]
2005^2-2004×2006
答
1.(A+B)(X+Y)-(B+A)(Y-X)=(A+B)[(X+Y)-(Y-X)]=(A+B)(X+Y-Y+X)=2X(A+B)2.144(A-B)^2-225(A+B)^2=[12(A-B)]^2-[15(A+B)]^2=[12(A-B)-15(A+B)][12(A-B)+15(A+B)]=(-3A-27B)(27A+3B)=-(3A+27B)(27A+3B)3.A^2B^2+4-4AB=(A...