计算【4(x+y)²-x-y】÷(x+y)
问题描述:
计算【4(x+y)²-x-y】÷(x+y)
答
原式=[4(x+y)²-(x+y)]÷(x+y)
=(x+y)[4(x+y)-1]÷(x+y)
=4(x+y)-1
=4x+4y-1