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

Toán Lớp 6: 5/7.8-17/8.9+1/9.10+1/10.11 2/3x-1/3=16x+1/2

Tháng Mười Hai 30, 2022 Toán học 1 Comment 0 views

Toán Lớp 6: 5/7.8-17/8.9+1/9.10+1/10.11 2/3x-1/3=16x+1/2

Comments ( 1 )

  1. ngochuong2k2
    ngochuong2k2
    30 Tháng Mười Hai, 2022 at 2:37 sáng
    Reply
    Sửa đề 
    a) 15/7.8- 17/8.9 + 1/9.10 + 1/10.11
    = (1/7 + 1/8) – (1/8 + 1/9) + 1/9 – 1/10 + 1/10 – 1/11
    = 1/7 + 1/8 -1/8 – 1/9 + 1/9 – 1/10 + 1/10 – 1/11
    = 1/7 – 1/11
    = 4/77
    b) 2/3 x – 1/3 = 16x + 1/2
    => 2/3 x – 16x= 1/2 + 1/3
    => (2/3 – 16)x = 3/6 + 2/6
    => -46/3 x = 5/6
    => x = 5/6 : (-46/3)
    => x= 5/6 . (-3/46)
    => x=-5/92
    Vậy x =-5/92
     

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

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