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最佳答案:(1)2x^2-4x+2=x^2-1x^2-4x+3=0(x-1)(x-3)=0x=1或x=3(2)(y+3)^2-8y=2(y+3)-4(y-1)y^2-2y
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最佳答案:1、x=4、x=0.5、x5;二。a+5,b/2-7,x/3-y,5n+5;三。设跑a周,400a=3000,a=7.5周;2.设甲笔买了a支,则乙铅笔买了20