一.(x+2y)×(x-2y)-(2x-y)(-2x-y),其中x=8,y=-8.二.一个长方形的周长是(3a-1)米,宽是2b米,如果它的宽增加2米,长不变,那么面积增加了多少平方米?三.工人在架设电线时,为了检验三条电线是否
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[1]a(x-2y)-b(2y-x)+d(2x-4y) [2]x平方-2xy+y平方-2x+2y+1 【3】一(a-x)(a-y)-x(y-a)(X-a)[1]a(x-2y)-b(2y-x)+d(2x-4y) [2]x平方-2xy+y平方-2x+2y+1【3】一(a-x)(a-y)-x(y-a)(X-a) 分解因式,急求!
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