分解因式:1、2a²-8ab 2、ax²-16ay² 3、a²(x-y)-4b²(x-y) 4、-2a³+12a²-18a 化简求值:(2a-b)²+(a-b)(a+b) 其中a=½ b=-2解方程或不等式:1、(x-1)²-(x-1)(x
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