﹙1﹚=2X﹙X�0�5-3X+Y﹚ ﹙2﹚-2a﹙2a�0�5-a+3﹚ ﹙3﹚﹙m-n﹚﹙m+n﹚ ﹙4﹚有问题 ﹙5﹚ = 5﹙X-Y﹚�0�5﹙X-Y-3X+3Y﹚=10﹙X-Y﹚�0�5﹙X+Y﹚ ﹙6﹚=2﹙Y-X﹚﹙2Y-2X+1﹚﹙7﹚=﹙X+Z-Y﹚�0�5 ﹙8﹚=ab﹙a+b﹚﹙x-y﹚ ﹙9﹚=﹙3x-2﹚﹙3x�0�5-5x+1﹚﹙10﹚=﹙X-Y﹚[b﹙x-y﹚�0�5+12y﹙x-y﹚-3x�0�5]