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

Toán Lớp 5: 1.Tìm x a.x+9/3=3/4 b.x-3/8=4/5 c.x x 2/3=5/6 d.x : 3/10 = 20 MỖI CÂU 5Đ NHA

Toán Lớp 5: 1.Tìm x
a.x+9/3=3/4
b.x-3/8=4/5
c.x x 2/3=5/6
d.x : 3/10 = 20
MỖI CÂU 5Đ NHA

Comments ( 1 )

  1. a)  x + 1/5 = 3/4 
    ⇒ x             = 3/4 – 1/5
    ⇒ x              = 15/20 – 4/20
    ⇒ x              = 11/20
    ______________________________________
    b)  x – 3/8 = 4/5
    ⇒ x            = 4/5 + 3/8
    ⇒ x            = 32/40 + 15/40
    ⇒ x            = 47/40
    _______________________________________
    c)  x × 2/3 = 5/6
    ⇒ x             = 5/6 : 2/3
    ⇒ x             = 5/6 × 3/2
    ⇒ x              = 5/4
    _________________________________________
    d)  x  : 3/10 = 20
    ⇒ x             = 20 × 3/10
    ⇒ x             = 6
     

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

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