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

Toán Lớp 7: 139 4/5:2/3-138 2/5:√4/9 Ai giải nhanh nhất vote 5sao :3

Toán Lớp 7: 139 4/5:2/3-138 2/5:√4/9
Ai giải nhanh nhất vote 5sao :3

Comments ( 1 )

  1. Giải đáp:
    $\\$
    139 4/5 ÷ 2/3 – 138 2/5 ÷ \sqrt{4/9}
    = 139 4/5 ×3/2 – 138 2/5 ÷ 2/3
    = 139 4/5 × 3/2 – 138 2/5 × 3/2
    = 3/2 × [139 4/5 – 138 2/5]
    = 3/2 × [139 + 4/5 – 138 – 2/5]
    = 3/2 × [(139 – 138) + (4/5 – 2/5) ]
    = 3/2 × [1 + 2/5]
    = 3/2 × [5/5 + 2/5]
    = 3/2 × 7/5
    = 21/10

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

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