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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: tìm số nguyên x biết: a) -14/35 = 8/x b) x+5/6 = -96/108

Toán Lớp 6: tìm số nguyên x biết:
a) -14/35 = 8/x b) x+5/6 = -96/108

Comments ( 2 )

  1.  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}$}$

                                                    $\textit{Chúc bạn học tốt nha}$

  2. 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

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222-9+11+12:2*14+14 = ? ( )

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