Toán Lớp 8: (x-1)^3-(x+2)(x^2-2x+4)+3(x-4)(x+4)
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Toán Lớp 8: (x-1)^3-(x+2)(x^2-2x+4)+3(x-4)(x+4)
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(x-1)^3-(x+2)(x^2-2x+4)+3(x-4)(x+4)
= x^3 – 3x^2 + 3x – 1 – ( x^3 + 2^3) + 3(x^2 – 4^2)
= x^3 – 3x^2 + 3x – 1 – x^3 – 8 + 3x^2 – 48
= 3x – 57
Chúc bạn học tốt!