求4xy-[x^y-(2xy-2x^y)+xy]-2x^2的值已知-2a^x+1b^4与3a^2b^2是同类项
问题描述:
求4xy-[x^y-(2xy-2x^y)+xy]-2x^2的值
已知-2a^x+1b^4与3a^2b^2是同类项
答
已知-2a^x+1b^4与3a^2b^2是同类项
x+1=2
y+2=4
得x=1,y=2
4xy-[x^y-(2xy-2x^y)+xy]-2x^2
=5xy-3x^y-2x^2
=10-3-2
=5