与直线2x-y+5=0平行的抛物线y=x^2的切线方程是:A.2x-y+3=0B.2x-y-3=0C.2x-y+1=0D.2x-y-1=0

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与直线2x-y+5=0平行的抛物线y=x^2的切线方程是:A.2x-y+3=0B.2x-y-3=0C.2x-y+1=0D.2x-y-1=0

与直线2x-y+5=0平行的抛物线y=x^2的切线方程是:A.2x-y+3=0B.2x-y-3=0C.2x-y+1=0D.2x-y-1=0
与直线2x-y+5=0平行的抛物线y=x^2的切线方程是:
A.2x-y+3=0
B.2x-y-3=0
C.2x-y+1=0
D.2x-y-1=0

与直线2x-y+5=0平行的抛物线y=x^2的切线方程是:A.2x-y+3=0B.2x-y-3=0C.2x-y+1=0D.2x-y-1=0
D
斜率相等 则切线方程为2x-y+a=0
把抛物线代入切线方程有唯一解
2x-x^2+a=0
x^2-2x-a=0
2^2-(-a)*4=0
a=-1