已知a.b为有理数,规定:a*b=a²+2ab.例如:3*2=3²+2×3×2=21.若(-2)*x=-2+x,求x的值.
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![已知a.b为有理数,规定:a*b=a²+2ab.例如:3*2=3²+2×3×2=21.若(-2)*x=-2+x,求x的值.](/uploads/image/z/627819-51-9.jpg?t=%E5%B7%B2%E7%9F%A5a.b%E4%B8%BA%E6%9C%89%E7%90%86%E6%95%B0%2C%E8%A7%84%E5%AE%9A%3Aa%2Ab%3Da%26%23178%3B%2B2ab.%E4%BE%8B%E5%A6%82%3A3%2A2%3D3%26%23178%3B%2B2%C3%973%C3%972%3D21.%E8%8B%A5%EF%BC%88%EF%BC%8D2%EF%BC%89%2Ax%3D-2%2Bx%2C%E6%B1%82x%E7%9A%84%E5%80%BC.)
已知a.b为有理数,规定:a*b=a²+2ab.例如:3*2=3²+2×3×2=21.若(-2)*x=-2+x,求x的值.
已知a.b为有理数,规定:a*b=a²+2ab.例如:3*2=3²+2×3×2=21.若(-2)*x=-2+x,求x的值.
已知a.b为有理数,规定:a*b=a²+2ab.例如:3*2=3²+2×3×2=21.若(-2)*x=-2+x,求x的值.
(-2)*x=(-2)²+2×(-2)×x=4-4x
又∵(-2)*x=-2+x
∴4-4x=-2+x
-5x=-6
x=6/5
x=0.4
a*b=a²+2ab (-2)*x=-2+x 即(-2)²+2(-2)x=2+x 4-4x=2+x 2=5x x=0.4
-1/4