Toán Lớp 7: Cho các số thực a,b,c,d,e thỏa mãn $\frac{a}{b}$=$\frac{b}{c}$ =$\frac{c}{d}$ =$\frac{d}{e}$
Cm rằng $\frac{(2019b+2020c – 2021d)}{(2019c+2020d-2021e)} ^{3}$ = $\frac{a^{2} }{bc}$
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Toán Lớp 7: Cho các số thực a,b,c,d,e thỏa mãn $\frac{a}{b}$=$\frac{b}{c}$ =$\frac{c}{d}$ =$\frac{d}{e}$
Cm rằng $\frac{(2019b+2020c – 2021d)}{(2019c+2020d-2021e)} ^{3}$ = $\frac{a^{2} }{bc}$
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