初二化简求值题[(5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x,其中x=2,y=3

问题描述:

初二化简求值题
[(5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x,其中x=2,y=3

原式可化为
[(15x²+16xy+4y²)+(x²-4y²)]/4x
=(16x²+16xy)/4x
=4x+4y
代入得
4×2+4×3=20