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

Toán Lớp 6: a) 225 : 15 + 3 x ( 2`x` +1 ) = 270

Toán Lớp 6: a) 225 : 15 + 3 x ( 2x +1 ) = 270

Comments ( 2 )

  1. 225 : 15 + 3 xx (2x + 1) = 270
    $\Rightarrow$ 15 + 3 xx (2x + 1) = 270
    $\Rightarrow$ 3 xx (2x + 1) = 270 – 15
    $\Rightarrow$ 3 xx (2x + 1) = 255
    $\Rightarrow$ (2x + 1) = 255 : 3
    $\Rightarrow$ 2x + 1 = 85
    $\Rightarrow$ 2x = 85 – 1
    $\Rightarrow$ 2x = 84
    $\Rightarrow$ x = 84 : 2
    $\Rightarrow$ x = 42
    $\text{Vậy}$ x = 42
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    225:15+3xx(2×1) =270
    =>15+3xx(2x+1)=270
    =>3xx(2x+1)=255
    =>2x+1=85
    =>2x=84
    =>x=42

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