(a-1)-(3a2-2a+1)已知:A=2乘以2-x+1,A-2b=x-1,求b
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![(a-1)-(3a2-2a+1)已知:A=2乘以2-x+1,A-2b=x-1,求b](/uploads/image/z/5918141-29-1.jpg?t=%EF%BC%88a-1%29-%283a2-2a%2B1%29%E5%B7%B2%E7%9F%A5%EF%BC%9AA%3D2%E4%B9%98%E4%BB%A52-x%2B1%2CA-2b%3Dx-1%2C%E6%B1%82b)
(a-1)-(3a2-2a+1)已知:A=2乘以2-x+1,A-2b=x-1,求b
(a-1)-(3a2-2a+1)
已知:A=2乘以2-x+1,A-2b=x-1,求b
(a-1)-(3a2-2a+1)已知:A=2乘以2-x+1,A-2b=x-1,求b
(a-1)-(3a²-2a+1)
=a-1-3a²+2a-1
=-3a²+3a-2
A=2(2-x)+1
=4-2x+1
=5-2x
代入A-2b=x-1
5-2x-2b=x-1
2b=-3x+6
所以b=-3x/2+3