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

Toán Lớp 5: tìm x a) ( x + 5,42 ) x 17 = 142,29. b) X x 8 + X x 15 = 653,2.

Toán Lớp 5: tìm x
a) ( x + 5,42 ) x 17 = 142,29.
b) X x 8 + X x 15 = 653,2.

Comments ( 2 )

  1. a) ( x + 5,42 ) × 17 = 142,29
    x+5,42=142,29:17
    x+5,42=8,37
    x=2,95
    Vậy x=2,95
    b) x × 8 + x× 15 = 653,2
    x×(8+15)=653,2
    x×23=653,2
    x=653,2:23
    x=28,4
    Vậy x=28,4

  2. a)  x + 5,42 = 142,29 : 17
        x + 5,42 = 8,37
                    x = 8,37 – 5,42
                    x = 2,95
    b)  x xx 8 + x xx 15 = 653,2
             x xx (8 + 15) = 653,2
                      x xx 23 = 653,2
                               x = 653,2 : 23
                               x =  28,4

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

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