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

Toán Lớp 5: Tìm X: 21,3 x X + 35,6 x X +42,1 x X + X = 39,7

Toán Lớp 5: Tìm X: 21,3 x X + 35,6 x X +42,1 x X + X = 39,7

Comments ( 2 )

  1. 21,3 × x + 35,6 × x + 42,1 × x + x = 39,7
    x × ( 21,3 + 42,1 + 35,6 + 1 ) = 39,7
    x × ( 63,4 + 36,6 ) = 39,7
    x × 100 = 39,7
    x = 39,7 : 100
    x = 0,397
    Vậy x = 0,397

  2. Giải đáp:
    21.3 xx x + 35.6 xx x +42.1 xx x + x = 39.7
    => x xx (21.3+35.6+42.1+1)=39.7
    => x xx 100 = 39.7
    => x = 39.7 : 100
    => x=0.397
    Vậy x=0.397

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

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