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

Toán Lớp 7: Bài 1: a) (-1/12) + (-5/6)+4/3 b) (-24/11) + (-19/13) + 2/11 + (20/13) c) (-3/16) + (-3/8) -5/4 d) (-25/13) + (-9/17) + 12/13 + -25/17

Tháng Hai 8, 2023 Toán học 2 Comments 0 views

Toán Lớp 7: Bài 1:
a) (-1/12) + (-5/6)+4/3
b) (-24/11) + (-19/13) + 2/11 + (20/13)
c) (-3/16) + (-3/8) -5/4
d) (-25/13) + (-9/17) + 12/13 + -25/17
giải hộ mk vs ạ

Comments ( 2 )

  1. tonhitruc
    tonhitruc
    8 Tháng Hai, 2023 at 11:41 sáng
    Reply
    a. $\dfrac{-1}{12}+\dfrac{-5}{6}+\dfrac43=\left(\dfrac{-1}{12}+\dfrac43\right)+\dfrac{-5}{6}$
    $= \dfrac{5}{4}+\dfrac{-5}{6}=\dfrac{-5}{12}$
    b. $\dfrac{-24}{11}+\dfrac{-19}{13}+\dfrac2{11}+\dfrac{20}{13}=\left(\dfrac{-24}{11}+\dfrac2{11}\right)+\left(\dfrac{-19}{13}+\dfrac{20}{13}\right)=-2+\dfrac1{13}=\dfrac{-25}{13}$
    c. $\dfrac{-3}{16}+\dfrac{-3}8+\dfrac{-5}4=\dfrac{-3}{16}+\dfrac{-6}{16}+\dfrac{-20}{16}=\dfrac{-29}{16}$
    d. $\dfrac{-25}{13}+\dfrac{-9}{17}+\dfrac{12}{13}+\dfrac{-25}{17}=\left(\dfrac{-25}{13}+\dfrac{12}{13}\right)+\left(\dfrac{-9}{17}+\dfrac{-25}{17}\right)=-1-2=-3$

  2. thudan
    thudan
    8 Tháng Hai, 2023 at 11:41 sáng
    Reply
    @Kem
    Bài 1:
    a) (-1/12) + (-5/6)+4/3
    = -11/12 + 4/3
    = -11/12 + 16/12
    = 5/12
    b, (-24/11) + (-19/13) + 2/11 + (20/13)
    = [(-24/11) + 2/11)] + [(-19/13) + (20/13)]
    = -2 + 1/13
    = -36/13
    = 35/13
    c) (-3/16) + (-3/8) -5/4
    = -3/16 + -6/16 – 5/4
    = -9/16 – 5/4
    = -9/16 – 20/16
    = -29/16
    d) (-25/13) + (-9/17) + 12/13 + -25/17
    = [(-25/13) + 12/13)] + [(-9/17)  + (-25/17)]
    = -1 + (-2)
    = -3

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

An Kim

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