﹙1﹚﹙xy－4x﹚＋x－3y
=xy-3x-3y
=xy-3(x+y)
=-2-3*3
=-11
﹙2﹚﹙3xy＋10y﹚＋[5x﹣﹙2xy＋2y－3x﹚]
=3xy+10y+5x-2xy-2y+3x
=xy+8y+8x
=xy+8(x+y)
=-2+8*3
=22