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

Toán Lớp 7: ` ( x : 2,2 ) . 1/6 = -3/8 . ( 0,5 – 8/5 ) `

Toán Lớp 7: ( x : 2,2 ) . 1/6 = -3/8 . ( 0,5 – 8/5 )

Comments ( 2 )

  1. (x:2,2) . 1/6=-3/9.(0,5-8/5)
    =>(x:11/5) . 1/6=-3/8.(1/2-8/5)
    =>(x . 5/11) . 1/6=-3/8.(-11/10)
    =>x . 5/11 . 1/6=3/8 . 11/10
    =>x.(5/11 . 1/6)=3/8 . 11/10
    =>x . 5/66=33/80
    =>x=33/80:5/66
    =>x=33/8 . 66/5
    =>x=1089/200=5,445
    Vậy x=5,445

  2. Giải đáp + Lời giải và giải thích chi tiết:
     (x:2,2) . 1/6 = -3/8 (0,5 – 8/5)
    <=> (x:11/5) . 1/6 = -3/8 . 1/2 – 3/8 . -8/5
    <=> (x:11/5) .1/6 = -3/16 +3/5
    <=> (x:11/5) .1/6 = 33/80
    <=> x:11/5 = 33/80 : 1/6
    <=> x:11/5 = 99/40
    <=> x=99/40 . 11/5
    <=> x=1089/200
    Vậy x=1089/200

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