如果单项式2ax的m次方y与单项式5bx2m-3的次方y的和是0
问题描述:
如果单项式2ax的m次方y与单项式5bx2m-3的次方y的和是0
如果单项式2ax^m y与单项式5bx^2m-3 y的和是0,且xy不等于0,求(2a+5b)^2007m的值
答
2ax^m y+5bx^2m-3 y=0
2ax^m y=-5bx^2m-3 y
2ax^m =-5bx^2m-3
得2a=-5b
x^m =x^2m-3
m=2m-3
m=3
(2a+5b)^2007m=0