3x2y−[2xy2−2(xy−3/2x2y)+xy]+3xy2.
问题描述:
3x2y−[2xy2−2(xy−
x2y)+xy]+3xy2. 3 2
答
原式=3x2y-(2xy2-2xy+3x2y+xy)+3xy2=3x2y-2xy2+2xy-3x2y-xy+3xy2=xy+xy2.
3x2y−[2xy2−2(xy−
x2y)+xy]+3xy2. 3 2
原式=3x2y-(2xy2-2xy+3x2y+xy)+3xy2=3x2y-2xy2+2xy-3x2y-xy+3xy2=xy+xy2.