已知x²+2x+3=4,那么多项式3x²+6x-2的值是( ).A.0B.1C.2D.3
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![已知x²+2x+3=4,那么多项式3x²+6x-2的值是( ).A.0B.1C.2D.3](/uploads/image/z/1963454-14-4.jpg?t=%E5%B7%B2%E7%9F%A5x%26%23178%3B%2B2x%2B3%3D4%2C%E9%82%A3%E4%B9%88%E5%A4%9A%E9%A1%B9%E5%BC%8F3x%26%23178%3B%2B6x-2%E7%9A%84%E5%80%BC%E6%98%AF%EF%BC%88+%EF%BC%89.A.0B.1C.2D.3)
已知x²+2x+3=4,那么多项式3x²+6x-2的值是( ).A.0B.1C.2D.3
已知x²+2x+3=4,那么多项式3x²+6x-2的值是( ).
A.0
B.1
C.2
D.3
已知x²+2x+3=4,那么多项式3x²+6x-2的值是( ).A.0B.1C.2D.3
已知x²+2x+3=4,那么多项式3x²+6x-2的值是( ).
x²+2x+3=4
x²+2x=1
3x²+6x-2
=3(x²+2x)-2
=3-2
=1
选B