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

Toán Lớp 7: a. ( $\dfrac{-2}{3}$ + $\dfrac{3}{7}$ ) : $\dfrac{4}{5}$ + ( $\dfrac{-1}{3}$ + $\dfrac{4}{7}$ : $\dfrac{4}{5}$ b. $\dfrac{5}{9}$ : ( $\

Home/ Toán Lớp 7: a. ( $\dfrac{-2}{3}$ + $\dfrac{3}{7}$ ) : $\dfrac{4}{5}$ + ( $\dfrac{-1}{3}$ + $\dfrac{4}{7}$ : $\dfrac{4}{5}$ b. $\dfrac{5}{9}$ : ( $\

Toán Lớp 7: a. ( $\dfrac{-2}{3}$ + $\dfrac{3}{7}$ ) : $\dfrac{4}{5}$ + ( $\dfrac{-1}{3}$ + $\dfrac{4}{7}$ : $\dfrac{4}{5}$ b. $\dfrac{5}{9}$ : ( $\

Tháng Tám 22, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: a. ( $\dfrac{-2}{3}$ + $\dfrac{3}{7}$ ) : $\dfrac{4}{5}$ + ( $\dfrac{-1}{3}$ + $\dfrac{4}{7}$ : $\dfrac{4}{5}$
b. $\dfrac{5}{9}$ : ( $\dfrac{1}{11}$ – $\dfrac{5}{22}$ ) + $\dfrac{5}{9}$ : ( $\dfrac{1}{15}$ – $\dfrac{2}{3}$ )
$\text{Trả lời + giải thích lun ạ:33}$

Comments ( 1 )

  1. chauhoangmy98
    chauhoangmy98
    22 Tháng Tám, 2022 at 8:49 sáng
    Reply
    Lời giải và giải thích chi tiết:
    a)
    ((-2)/3 + 3/7) : 4/5 + ((-1)/3 + 4/7) : 4/5
    = 5/4 . [(-2)/3 + 3/7 + (-1)/3 + 4/7]
    = 5/4 . [(-1) + 1]
    = 5/4 . 0
    = 0
    b)
    5/9 : (1/11 – 5/22) + 5/9 : (1/15 – 2/3)
    = 5/9 : (2/22 – 5/22) + 5/9 : (1/15 – 10/15)
    = 5/9 : (-3/22) + 5/9 : (-3/5)
    = 5/9 . (-22/3) + 5/9 . (-5/3)
    = 5/9 . [(-22/3) + (-5/3)]
    = 5/9 . (-9)
    = -5

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

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