因式分解(-1/2x-1/5y)²
问题描述:
因式分解(-1/2x-1/5y)²
答
(-1/2x-1/5y)²
=(-1/2x)²+2*(-1/2x)*(-1/5y)+(-1/5y)²
=1/4x²+1/5xy+1/25y²