\(A+B=\left(2.x^5y^4z\right)+\left(-5x^5y^4z\right)\)
\(\Rightarrow A+B=\left(2-5\right).\left(x^5x^5\right).\left(y^4y^4\right).\left(zz\right)\)
A+B=-3.x10.y8.z2
AB lam tuong tu
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