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

Toán Lớp 6: $\frac{3}{4}$ + $\frac{19}{-20}$ = $\frac{x}{15}$

Toán Lớp 6: $\frac{3}{4}$ + $\frac{19}{-20}$ = $\frac{x}{15}$

Comments ( 2 )

  1. 3/4+19/-20=x/15

    ->3/4+(-19)/20=x/15

    ->15/20+(-19)/20=x/15

    ->(15+(-19))/20=x/15

    ->(-4)/20=x/15

    ->(-1)/5=x/15

    ->5.x=15.(-1)

    ->5x=-15

    ->x=(-15):5

    ->x=-3

    Vậy x=-3

  2. Giải đáp:

    x =-3

    Lời giải và giải thích chi tiết:

    3/4 +19/(-20) =x/15

    => (-15)/(-20) +19/(-20) =x/15

    => 4/(-20) =x/15

    => 1/(-5) = x/15

    => x = 1/(-5) . 15 = -3

    Vậy x =-3

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