(-1/5x+1/10y)^2
问题描述:
(-1/5x+1/10y)^2
答
(-1/5x+1/10y)^2
=(-1/5x)^2+2(-1/5x)(1/10y)+(1/10y)^2
=1/25x^2-1/25xy+1/100y^2