已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求:{1}2A-B{2}3A-B
问题描述:
已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求:{1}2A-B{2}3A-B
答
(1)得:2x2-5x-5y (2) 2x2-9y-3x
已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求:{1}2A-B{2}3A-B
(1)得:2x2-5x-5y (2) 2x2-9y-3x