若x,y的单项式2ax^my与5bx^(2m-3)y是同类项ab不等于0,m=3,若2ax^my+5bx^(2m-3)y=0
问题描述:
若x,y的单项式2ax^my与5bx^(2m-3)y是同类项ab不等于0,m=3,若2ax^my+5bx^(2m-3)y=0
求a+5b分之2a-3b的值
答
2ax^my+5bx^(2m-3)y=0
所以系数是相反数
2a=-5b
b=-2a/5
所以原式=(a-2a)分之(3a+6a/5)
=-a分之(21a/5)
=5分之21