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12 tháng 7 2021
a) Ta có: \(f\left(x\right)=2x^2\left(x-1\right)-5\left(x+2\right)-2x\left(x-2\right)\)
\(=2x^3-2x^2-5x-10-2x^2+4x\)
\(=2x^3-4x^2-x-10\)
Bậc là 3
Ta có: \(g\left(x\right)=x^2\left(2x-3\right)-x\left(x+1\right)-\left(3x-2\right)\)
\(=2x^3-3x^2-x^2-x-3x+2\)
\(=2x^3-4x^2-4x+2\)
12 tháng 7 2021
b) Ta có: h(x)=f(x)-g(x)
\(=2x^3-4x^2-x-10-2x^3+4x^2+4x-2\)
\(=3x-12\)
Đặt h(x)=0
nên 3x-12=0
hay x=4
28 tháng 8 2020
bạn vô đường link này đi : https://olm.vn/hoi-dap/detail/51053415727.html
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