Question

[Chi Nghiêm]

\(a,\dfrac{15-x}{14}=\dfrac{5}{7}\)

\(b,\dfrac{x}{9}=\dfrac{17}{3}\)

\(c,15-\dfrac{x}{2}=\dfrac{3}{7}\)

Tìm x

Answer 1

[⭐Hannie⭐]

\(\dfrac{15-x}{14}=\dfrac{5}{7}\\ \left(15-x\right)\times7=5\times14\\ \left(15-x\right)\times7=70\\ 15-x=70:7\\ 15-x=10\\ x=15-10\\ x=5\)

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\(\dfrac{x}{9}=\dfrac{17}{3}\\ x\times3=17\times9\\ x\times3=153\\ x=153:3\\ x=51\)

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\(15-\dfrac{x}{2}=\dfrac{3}{7}\\ \dfrac{x}{2}=15-\dfrac{3}{7}\\ \dfrac{x}{2}=\dfrac{102}{7}\\ x\times7=102\times2\\ x\times7=204\\ x=204:7\\ x=\dfrac{204}{7}\)

Answer 2

[Chi Nghiêm]

???