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

Toán Lớp 5: tim x , biet: a) X x 2,5 – 6,8 =17,2 b) 25,52 – x : 2,5 = 4,61 c) 12,6 – x + 4,5 = 6,3 d) x – 75/100 = 125/100 + 9/10

Toán Lớp 5: tim x , biet:
a) X x 2,5 – 6,8 =17,2
b) 25,52 – x : 2,5 = 4,61
c) 12,6 – x + 4,5 = 6,3
d) x – 75/100 = 125/100 + 9/10

Comments ( 2 )

  1. a) x × 2,5 – 6,8 = 17,2
    x × 2,5 = 17,2 + 6,8
    x × 2,5 = 24
    x = 24 ÷ 2,5
    x = 9,6
    b) 25,52 – x ÷ 2,5 = 4,61
    x ÷ 2,5 = 25,52 – 4,61
    x ÷ 2,5 = 20,91
    x = 20,91 × 2,5
    x = 52,275
    c) 12,6 – x + 4,5 = 6,3
    x + 4,5 = 12,6 – 6,3
    x + 4,5 = 6,3
    x = 6,3 – 4,5
    x = 1,8
    d) x – 75/100 = 125/100 + 9/10
    x – 75/100 = 215/100
    x = 215/100 + 75/100
    x = 29/10

  2. a)
    x × 2,5 – 6,8 = 17,2
    x × 2,5 = 17,2 + 6,8
    x × 2,5 = 24
    x = 24 : 2,5
    x = 9,6
    b)
    25,52 – x : 2,5 = 4,61
    x : 2,5 = 25,52 – 4,61
    x : 2,5 = 20,91
    x = 20,91 × 2,5
    x = 52,275
    c)
    12,6 – x + 4,5 = 6,3
    12,6 – x = 6,3 – 4,5
    12,6 – x = 1,8
    x = 12,6 – 1,8
    x = 10,8
    d)
    x – 75/100 = 125/100 + 9/10
    x – 75/100 = 215/100
    x = 215/100 + 75/100
    x = 290/100 = 29/10

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

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