Question

如果单项式2ax的m次方与单项式5bx的2m-3的和是0,且xy不等于0,求（2a+5b)的2007m次方的值.

Answer 1

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,且xy不等于0,求（2a+5b)的2007m次方的值.

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