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kienlam365
2 năm trước
Rút gọn và tính giá trị biểu thức a). 27+(x-3)×(x^2-3x-9) với x=3 b). x^3-9x^2+27x-27 với x=5 c). x^3+3x^2+3x-1 với x=99 Mọi người giúp em với ạ.
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