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

Toán Lớp 5: c) 125% × x = 4,9 – 2,4 d) x : 30% + 2,25 = 2,25 × 10

Toán Lớp 5: c) 125% × x = 4,9 – 2,4 d) x : 30% + 2,25 = 2,25 × 10

Comments ( 2 )

  1. c) 125% xx x = 4,9 – 2,4

    ⇒ 1,25 xx x = 2,5

    ⇒ x = 2,5 : 1,25

    ⇒ x = 2

    Vậy x = 2

    d) x : 30% + 2,25 = 2,25 xx 10

    ⇒ x : 0,3 + 2,25 = 22,5

    ⇒ x : 0,3 = 22,5 – 2,25

    ⇒ x : 0,3 = 20,25

    ⇒ x = 20,25 xx 0,3

    ⇒ x = 6,075

    Vậy x = 6,075

     

  2. c) 125% xx x=4,9-2,4

    1,25xx x=2,5

    x=2,5:1,25

    x=2

    Vậy x=2

    d)x:30%+2,25=2,25xx10

    x:0,3+2,25=22,5

    x:0,3=22,5-2,25

    x:0,3=20,25

    x=20,25xx0,3

    x=6,075

    Vậy x=6,075

    \text{# Mạc}

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