Toán Lớp 6: tìm số nguyên x biết:
a) -14/35 = 8/x b) x+5/6 = -96/108
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Toán Lớp 6: tìm số nguyên x biết:
a) -14/35 = 8/x b) x+5/6 = -96/108
Comments ( 2 )
a) $\text{$\frac{-14}{35}$ = $\frac{8}{x}$ }$
⇔$\text{-14.x=8.35}$
⇔$\text{-14.x=280}$
⇔$\text{x=280:(-14)}$
⇔$\text{x=20}$
b) $\text{x+ $\dfrac{5}{6}$=$\dfrac{-96}{108}$}$
⇔$\text{x+$\dfrac{5}{6}$=$\dfrac{-8}{9}$}$
⇔$\text{x= $\dfrac{-8}{9}$-$\dfrac{5}{6}$}$
⇔$\text{x=$\dfrac{-16}{18}$-$\dfrac{15}{18}$}$
⇔$\text{x=$\dfrac{-31}{18}$}$
$\textit{Chúc bạn học tốt nha}$
a,
-14/35 = 8/x
->-14x = 35 xx 8
->-14x = 280
-> x = 280 : -14
-> x = -20
____________________
b) $\dfrac{x+5}{6}$ = -96/108
->(x+5) xx 108 = (-96) xx 6
->108x + 540 = -576
-> 108x = -576 – 540
-> 108x = -1116
-> x = -1116: 108
-> x =-31/3