Toán Lớp 7: $\frac{2a}{3}$ =$\frac{3b}{4}$ =$\frac{4c}{5}$
và a+b+c=49
Tìm a,b,c
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Toán Lớp 7: $\frac{2a}{3}$ =$\frac{3b}{4}$ =$\frac{4c}{5}$
và a+b+c=49
Tìm a,b,c
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