若x^2 4x-5和2-2x的值互为相反数 则x的值为?A.3或1B.1或-3C.1或-7D.-7或1
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![若x^2 4x-5和2-2x的值互为相反数 则x的值为?A.3或1B.1或-3C.1或-7D.-7或1](/uploads/image/z/1636949-29-9.jpg?t=%E8%8B%A5x%5E2+4x-5%E5%92%8C2-2x%E7%9A%84%E5%80%BC%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0+%E5%88%99x%E7%9A%84%E5%80%BC%E4%B8%BA%3FA.3%E6%88%961B.1%E6%88%96-3C.1%E6%88%96-7D.-7%E6%88%961)
若x^2 4x-5和2-2x的值互为相反数 则x的值为?A.3或1B.1或-3C.1或-7D.-7或1
若x^2 4x-5和2-2x的值互为相反数 则x的值为?
A.3或1
B.1或-3
C.1或-7
D.-7或1
若x^2 4x-5和2-2x的值互为相反数 则x的值为?A.3或1B.1或-3C.1或-7D.-7或1
x^2 +4x-5=2x-2
xx+2x-3=0
得,(x+3)(x-1)=0
所以选:B