去括号:1/2(2X²Y-3XY²+4XY-X²Y²)=?
问题描述:
去括号:1/2(2X²Y-3XY²+4XY-X²Y²)=?
答
1/2(2X²Y-3XY²+4XY-X²Y²)
=x²y-3/2xy²+2xy-1/2x²y²
答
原式=X²Y-1.5XY²+2XY-0.5X²Y²