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

Toán Lớp 7: 3/7 +{-5/2} + {-3/5} 2/3[{-7/4} – {1/2 + 3/8}]

Toán Lớp 7: 3/7 +{-5/2} + {-3/5}
2/3[{-7/4} – {1/2 + 3/8}]

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    3/7 + (-5/2) + (-3/5)
    = 6/14 + (-35/14) + (-3)/5
    = -29/14 +(-3)/5
    = -145/70 + (-42)/70
    = -187/70
    ___________________________________
    2/3[(-7/4) – 1/2 + 3/8 ]
    = 2/3 [-14/8 + 4/8 + 3/8]
    =2/3 . -7/8
    = -7/12
    $#Vịt vàng$

  2. Giải đáp:
     3/7 +(-5/2)+ (-3/5)
    = 3/7 – 5/2 – 3/5
    = 30/70 – 175/70 – 42/70
    = -187/70
    2/3[(-7/4)- (1/2 + 3/8)]
    = 2/3 [(-7/4)- 7/8]
    = 2/3. (-21)/8
    = -7/4

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

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