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

Toán Lớp 7: Bài 1 : Tính a. -4/7 – 5/13. -39/25 + -1 /42 [ -5/6] b. 2/9.[ -4/45: ( 1/5+2/15) + 1 2/2] – – 5 /5/27 Bài 2 : B= [ -1/6] . [ 15/19] .3

Toán Lớp 7: Bài 1 : Tính
a. -4/7 – 5/13. -39/25 + -1 /42 [ -5/6]
b. 2/9.[ -4/45: ( 1/5+2/15) + 1 2/2] – – 5 /5/27
Bài 2 :
B= [ -1/6] . [ 15/19] .38/45
C= [ -5/9 ] .3/11+[ -13/18] .8/11
D= [ 2 2/15 . 8/17.3/32] : ( -3/17)

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    Bài 1:
    a, -4/7 – 5/13 . (-39)/25 + (-1)/42 . (-5)/6
    = -4/7 + 3/5 + 5/252
    = 1/35 + 5/252
    = 61/1260
    b, 2/9 . [ -4/45 : ( 1/5 + 2/15 ) + 1 2/2 ] – (-5 5/27 )
    = 2/9 . [ -4/45 : 1/3 + 2 ] + 140/27
    = 2/9 . [ -4/15 + 2 ] + 140/27
    = 2/9 . 26/15 + 140/27
    = 52/135 + 140/27
    = 752/135
    Bài 2:
    B = (-1/6) . 15/19 . 38/45
    B = -5/38 . 38/45
    B = -1/9
    _____________
    C = (-5/9) . 3/11 + (-13/18) . 8/11
    C = -5/33 – -52/99
    C = -67/99
    ____________
    D = ( 2 2/15 . 8/17 . 3/32 ) : (-3/17)
    D = ( 32/15 . 3/68 ) . (-17/3)
    D = 8/85 . (-17/3)
    D = -8/15

  2. text(Bài 1 🙂
    a)
    (-4)/7 – 5/13 . (-39)/25 + (-1)/42 . (-5)/6
    = (-4)/7 + 3/5 + 5/252
    = -144/252 + 5/252 + 3/5
    = -139/252 + 3/5
    = 61/1260
    b)
    2/9 . [(-4)/45 : (1/5 + 2/15) + 1 2/2] – (-5 5/27)
    = 2/9 . [(-4)/45 . 3 + 2] + 140/27
    = 2/9 . 26/15 + 140/27
    = 52/135 + 700/135
    = 752/135
    text(Bài 2 🙂
    B = (-1/6) . (15/19) . 38/45
    B = (-1/6) . 2/3
    B = (-1/9)
    C = (-5/9) . 3/11 + (-13/18) . 8/11
    C = (-5/33) – 52/99
    C = (-15/99) – 52/99
    C = -67/99
    D = (2 2/15 . 8/17 . 3/32) : (-3/17)
    D = (32/15 . 3/32 . 8/17) . (-17)/3
    D = 1/5 . 8/17 . (-17)/3
    D = 1/5 . (-8)/3
    D = (-8)/15

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

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