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

Toán Lớp 5: Câu 53: Tìm x biết: 9/6×(x-5/3)+3/2×5/3=3 a/ x = 4/3 b/ x = 2 c/ x = 1/2 d/ x = 2/3 Câu 54: Tìm x biết: 8/12×(x-3/8)+2/3×3/8=1 a/ x

Toán Lớp 5: Câu 53: Tìm x biết: 9/6×(x-5/3)+3/2×5/3=3
a/ x = 4/3 b/ x = 2 c/ x = 1/2 d/ x = 2/3
Câu 54: Tìm x biết: 8/12×(x-3/8)+2/3×3/8=1
a/ x = 4/3 b/ x = 2 c/ x = 1/2 d/ x = 3/2

Comments ( 2 )

  1. 53)9/6×(x-5/3)+3/2×5/3=3
    9/6xx(x-5/3)+5/2=3
    9/6xx(x-5/3)=3-5/2
    9/6xx(x-5/3)=1/2
    x-5/3=1/2:9/6
    x-5/3=1/3
    x=1/3+5/3
    x=2
    =>B
    54)8/12×(x-3/8)+2/3×3/8=1
    8/12xx(x-3/8)+1/4=1
    8/12xx(x-3/8)=1-1/4
    8/12xx(x-3/8)=3/4
    x-3/8=3/4:8/12
    x-3/8=9/8
    x=9/8+3/8
    x=3/2
    =>D
     

  2. Câu 53:
    9/6 xx (x – 5/3) + 3/2 xx 5/3 = 3
    9/6 xx (x – 5/3) + 5/2 = 3
    9/6 xx (x – 5/3) = 3 – 5/2
    9/6 xx (x – 5/3) = 1/2
    (x – 5/3) = 1/2 : 9/6
    x – 5/3 = 1/3
    x = 1/3 + 5/3
    x = 6/3
    x = 2
    => B
    Câu 54:
    8/12 xx (x – 3/8) + 2/3 xx 3/8 = 1
    8/12 xx (x – 3/8) + 1/4 = 1
    8/12 xx (x – 3/8) = 1 – 1/4
    8/12 xx (x – 3/8) = 3/4
    (x – 3/8) = 3/4 : 8/12
    x – 3/8 = 9/8
    x = 9/8 + 3/8
    x = 12/8
    x = 3/2
    => D

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

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