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

Toán Lớp 7: Tính a) 3/7 + ( -5/2) + (-3/5) b) (-4/3) + (-2/5) + (-3/2); c) 4/5 – (-2/7) – 7/10; d) 2/3 – [( -7/4) – (1/2 + 3/8)]

Home/ Toán Lớp 7: Tính a) 3/7 + ( -5/2) + (-3/5) b) (-4/3) + (-2/5) + (-3/2); c) 4/5 – (-2/7) – 7/10; d) 2/3 – [( -7/4) – (1/2 + 3/8)]

Toán Lớp 7: Tính a) 3/7 + ( -5/2) + (-3/5) b) (-4/3) + (-2/5) + (-3/2); c) 4/5 – (-2/7) – 7/10; d) 2/3 – [( -7/4) – (1/2 + 3/8)]

Tháng Mười 2, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: Tính
a) 3/7 + ( -5/2) + (-3/5)
b) (-4/3) + (-2/5) + (-3/2);
c) 4/5 – (-2/7) – 7/10;
d) 2/3 – [( -7/4) – (1/2 + 3/8)]

Comments ( 2 )

  1. dinhcongson
    dinhcongson
    2 Tháng Mười, 2022 at 7:59 sáng
    Reply
    Lời giải và giải thích chi tiết:
    a)
    3/7 + (-5/2) + (-3/5)
    = 30/70 – 175/70 – 42/70
    = -187/70
    b)
    (-4/3) + (-2/5) + (-3/2)
    = -40/30 – 12/30 – 45/30
    = -97/30
    c)
    4/5 – (-2/7) – 7/10
    = 56/70 + 20/70 – 49/70
    = 27/70
    d)
    2/3 – [(-7/4) – (1/2 + 3/8)]
    = 2/3 – (-14/8 – 7/8)
    = 2/3 + 21/8
    = 16/24 + 63/24
    = 79/24

  2. tongtung
    tongtung
    2 Tháng Mười, 2022 at 7:58 sáng
    Reply
    a):
    3/7 + ( -5/2) + (-3/5)
    = 6/14 – 35/14 – 3/5
    = -29/14 – 3/5
    = -145/70 – 42/70
    = -187/70
    b):
    (-4/3) + (-2/5) + (-3/2)
    = -20/15 – 6/15 – 3/2
    = -26/15 – 3/2
    = -52/30 – 45/30
    = -97/30
    c):
    4/5 – (-2/7) – 7/10
    = 4/5 + 2/7 – 7/10
    = 28/35 + 10/35 – 7/10
    = 38/35 – 7/10
    = 76/70 – 49/70
    = 27/70
    d):
    2/3 – [( -7/4) – (1/2 + 3/8)]
    = 2/3 – (-7/4 – 7/8)
    = 2/3 – (-21/8)
    = 2/3 + 21/8
    = 79/24
    Cho mình xin hay nhất nha bạn
    @Drew McIntyre
     

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

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