Toán Lớp 7: 1/ Tìm x, y biết
$\frac{1+2y}{18}$ = $\frac{1+4y}{24}$ = $\frac{1+6y}{6x}$
2/ Cho dãy tỉ số: $\frac{bz-cy}{a}$ = $\frac{cx-az}{b}$ = $\frac{ay-bx}{c}$. Chứng minh rằng $\frac{x}{a}$ = $\frac{y}{b}$ = $\frac{z}{c}$
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Toán Lớp 7: 1/ Tìm x, y biết
$\frac{1+2y}{18}$ = $\frac{1+4y}{24}$ = $\frac{1+6y}{6x}$
2/ Cho dãy tỉ số: $\frac{bz-cy}{a}$ = $\frac{cx-az}{b}$ = $\frac{ay-bx}{c}$. Chứng minh rằng $\frac{x}{a}$ = $\frac{y}{b}$ = $\frac{z}{c}$
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