a cong b tat ca mu 3 chia cho a mu 3 nhan cho b

Question

a cong b tat ca mu 3 chia cho a mu 3 nhan cho b

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Melanie 5 phút 2021-09-09T14:17:51+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-09-09T14:19:06+00:00

    Đáp án:

    $\frac{(a+b)^{3}}{a^{3}.b}$ =$\frac{a^{3}+b^{3}+3ab(a+b)}{a^{3}.b}$

    =$\frac{1}{b}$ +$\frac{b^{2}}{a^{3}}$ +$\frac{3(a+b)}{a^{2}}$

    0
    2021-09-09T14:19:33+00:00

    Bạn tham khảo : 

        $(a+b)^3 : a^3 . b = (a+b) . (a+b) . (a+b) : a^3 .b = a^3 + b^3 : a^3 + b = (a^3 :a^3) + (b^3 :b) = 1+b^2$

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