计算:2(2x-3y)-3(4x-5y)
问题描述:
计算:2(2x-3y)-3(4x-5y)
答
2(2x-3y)-3(4x-5y)
=4x-6y-12x+15y
=(4x-12x)+(15y-6y)
=-8x+9y