计算题:(1/2x+1/3y)(-2/3y+1/2x)
问题描述:
计算题:(1/2x+1/3y)(-2/3y+1/2x)
答
原式=1/2x(-2/3y+1/2x)+1/3y(-2/3y+1/2x)
=-1/3xy+1/4x²-2/9y²+1/6xy
=1/4x²-2/9y²-1/6xy