单项式的乘法...已知a(x^2+x-c)+b(2x^2-x-2)=7x^2+4x+3,求a,b,c的值.【解】a(x^2+x-c)+b(2x^2-x-2)=7x^2+4x+3,(a+2b)x^2+(a+b)x+ac+2b=7x^2+4x+3.①根据对应项系数相等,有a+2b=7 a=1 a+b=4 ② b=3 ac+2b=3 c=-3回
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![单项式的乘法...已知a(x^2+x-c)+b(2x^2-x-2)=7x^2+4x+3,求a,b,c的值.【解】a(x^2+x-c)+b(2x^2-x-2)=7x^2+4x+3,(a+2b)x^2+(a+b)x+ac+2b=7x^2+4x+3.①根据对应项系数相等,有a+2b=7 a=1 a+b=4 ② b=3 ac+2b=3 c=-3回](/uploads/image/z/1989282-66-2.jpg?t=%E5%8D%95%E9%A1%B9%E5%BC%8F%E7%9A%84%E4%B9%98%E6%B3%95...%E5%B7%B2%E7%9F%A5a%EF%BC%88x%5E2%2Bx-c%EF%BC%89%2Bb%EF%BC%882x%5E2-x-2%EF%BC%89%3D7x%5E2%2B4x%2B3%2C%E6%B1%82a%2Cb%2Cc%E7%9A%84%E5%80%BC.%E3%80%90%E8%A7%A3%E3%80%91a%EF%BC%88x%5E2%2Bx-c%EF%BC%89%2Bb%EF%BC%882x%5E2-x-2%EF%BC%89%3D7x%5E2%2B4x%2B3%2C%EF%BC%88a%2B2b%EF%BC%89x%5E2%2B%EF%BC%88a%2Bb%EF%BC%89x%2Bac%2B2b%3D7x%5E2%2B4x%2B3.%E2%91%A0%E6%A0%B9%E6%8D%AE%E5%AF%B9%E5%BA%94%E9%A1%B9%E7%B3%BB%E6%95%B0%E7%9B%B8%E7%AD%89%2C%E6%9C%89a%2B2b%3D7+a%3D1+a%2Bb%3D4+%E2%91%A1+b%3D3+ac%2B2b%3D3+c%3D-3%E5%9B%9E)
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