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

Toán Lớp 5: 2,5xX+3,77xX+1,25xX=20 (X-1/2)x5/3=7/4-1/2 0,8xX=1,2×10

Toán Lớp 5: 2,5xX+3,77xX+1,25xX=20
(X-1/2)x5/3=7/4-1/2
0,8xX=1,2×10

Comments ( 2 )

  1. Giải đáp:+Lời giải và giải thích chi tiết:
     2,5 × x + 3,77 × x + 1,25 × x = 20
     x × ( 2,5 + 3,77 + 1,25 ) = 20
     x × 7,52 = 20
     x = 20 : 7,52
     x = 20 : 188/25
     x = 20 × 25/188
     x = 125/47
    ( x – 1/2 ) × 5/3 = 7/4 – 1/2
    ( x – 1/2 ) × 5/3 = 5/4
    x – 1/2 = 5/4 : 5/3
    x – 1/2 = 3/4
    x = 3/4 + 1/2
    x = 5/4
    0,8 × x = 1,2 × 10
    0,8 × x = 12
             x = 12 : 0,8
             x = 15

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