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

Toán Lớp 7: A) -7/2 + -2/3 + -3/5 B) (-1/4 + 1/5 ) : (49/48 – 1,25 ) C) 2/7 – 24/12 : 3/5 D) -5/7 + 1/7 ( 3/4 -5/1) E) 7/8 : (2/9 – 1/8 ) + 7/8 : (

Tháng Chín 9, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: A) -7/2 + -2/3 + -3/5
B) (-1/4 + 1/5 ) : (49/48 – 1,25 )
C) 2/7 – 24/12 : 3/5
D) -5/7 + 1/7 ( 3/4 -5/1)
E) 7/8 : (2/9 – 1/8 ) + 7/8 : (1/36 – 5/12)
Làm giúp mình ạ

Comments ( 1 )

  1. cattien
    cattien
    9 Tháng Chín, 2022 at 1:05 chiều
    Reply
    a)(-7/2)+ (-2/3)+ (-3/5)
    =(-105/30)+(-20/30)+(-6/30)
    =-131/30
    b)(-1/4+1/5):(49/48-1,25)
    =(-5/20+4/20):(49/48-5/4)
    =-1/20:(49/48-60/48)
    =-1/20:(-11/48)
    =-12/55
    c)2/7-24/12:3/5
    =2/7-2 . 3/5
    =2/7.(-6/5)
    =-12/35
    d)-5/7+1/7.(3/4-5/1)
    =-5/7+1/7.(3/4-20/4)
    =-5/7+1/7.(-17/4)
    =-5/7+17/28
    =-20/28+17/28
    =-3/28
    e)7/8:(2/9-1/8)+7/8:(1/36-5/12)
    =7/8:(16/72-9/72)+7/8:(1/36-15/36)
    =7/8:7/12+7/8:(-14/36)
    =7/8:[21/36+(-14/36)]
    =7/8:7/36
    =9/2

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

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