a2b33c2ba2用分解因式详细步骤怎么写﹙a-2b﹚3-3c﹙2b-a﹚2=﹙a-2b﹚3-3c﹙a-2b﹚2=﹙a-2b﹚2[﹙a-2b﹚-3c]=﹙a-2b﹚2﹙a-2b-3c﹚2,愤怒的火柴人angerofstick2第4关怎么过有一根黑色柱子挡住呢百度知上电梯23443213,已知x22x2将下式先化简再求值x^2-2x=2,(x-1)^2=3x^2=2(x+1)(x-1)2+(x+3)(x-3)+(x-3)(x-1)=3+(x-3)(2x+2)=3+2(x-3)(x+1)=3+2(x^2