_____已知|ax-2y-4|√2x+4 互为相反数,且x与y互为相反数,求a的值._____ _____ _____若x.y满足y=√ 1-2x+√(x-1)²+√2x-1,则x+y的算术平方根是多少?_____ _____若√ a-1 +√ ab-2=0.求1 1 1 1_____+_______________+________
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