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

Toán Lớp 5: tìm x , biết a) x – 1/3 = 1/7 b) x – 1/24 = 5/8 – 1/31 c) x – 1/5 = 3/35 x 7/6 d) x x ( 1/1×2 + 1/2×3 + 1/3×4 + – + 1/99×100 ) = 99

Home/ Toán Lớp 5: tìm x , biết a) x – 1/3 = 1/7 b) x – 1/24 = 5/8 – 1/31 c) x – 1/5 = 3/35 x 7/6 d) x x ( 1/1×2 + 1/2×3 + 1/3×4 + – + 1/99×100 ) = 99

Toán Lớp 5: tìm x , biết a) x – 1/3 = 1/7 b) x – 1/24 = 5/8 – 1/31 c) x – 1/5 = 3/35 x 7/6 d) x x ( 1/1×2 + 1/2×3 + 1/3×4 + – + 1/99×100 ) = 99

Tháng Mười 28, 2022 Toán học 2 Comments 0 views

Toán Lớp 5: tìm x , biết
a) x – 1/3 = 1/7
b) x – 1/24 = 5/8 – 1/31
c) x – 1/5 = 3/35 x 7/6
d) x x ( 1/1×2 + 1/2×3 + 1/3×4 + …. + 1/99×100 ) = 99/100
e) 720 : [( 41 – ( 2x – 5 )] = 20

Comments ( 2 )

  1. quynhmaithu
    quynhmaithu
    28 Tháng Mười, 2022 at 4:54 chiều
    Reply
    a):
    x – 1/3 = 1/7
    x = 1/7 + 1/3
    x = 10/21
    b):
    x – 1/24 = 5/8 – 1/31
    x – 1/24 = 147/248
    x = 147/248 + 1/24
    x = 59/93
    c):
    x – 1/5 = 3/35 xx 7/6
    x – 1/5 = 21/210
    x = 21/210 + 1/5
    x = 3/10
    d):
    x xx ( 1/( 1 xx 2) + 1/( 2 xx 3) + 1/( 3 xx 4) + … + 1/( 99 xx 100)) = 99/100
    x xx ( 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + …. + 1/99 – 1/100) = 99/100
    x xx ( 1 – 1/100) = 99/100
    x xx 99/100 = 99/100
    x = 99/100 : 99/100
    x = 1
    e):
    720 : [( 41 – ( 2x – 5 )] = 20
    [41 – (2x – 5)] = 720 : 20
    [41 – (2x – 5)] = 36
    (2x-5) = 41 – 36
    (2x-5) = 5
    2x = 5 + 5
    2x = 10
    x = 10 : 2
    x = 5
    Cho mình xin hay nhất nha bạn!!!!
    @Drew Mclntyre
     

  2. dongoclandiem
    dongoclandiem
    28 Tháng Mười, 2022 at 4:54 chiều
    Reply
    a) x – 1/3 = 1/7
    x = 1/7 + 1/3
    x= 10/21
    Vậy x = 10/21
    b) x – 1/24 = 5/8 – 1/31
    x – 1/24  =  147/248
    x = 147/248 + 1/24
    x= 59/93
    Vậy x = 59/93
    c) x – 1/5 = 3/35 xx 7/6
    x – 1/5 = 1/10
    x = 1/10 + 1/5
    x= 3/10
    d) x xx ( 1/( 1 xx 2) + 1/( 2 xx 3) + 1/( 3 xx 4) + … + 1/( 99 xx 100)) = 99/100
    x xx ( 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + …. + 1/99 – 1/100) = 99/100
    x xx ( 1 – 1/100) = 99/100
    x xx 99/100 = 99/100
    x = 99/100 : 99/100
    x = 1
    Vậy x = 1
    e) 720 : [ 41 – ( 2x – 5)] = 20
    [ 41 – (2x – 5)] = 720 : 20
    41 – (2x – 5) =  36
    (2x – 5) = 41 – 36
    2x – 5 = 5
    2x = 5 + 5
    2x = 10
    x = 10 : 2
    x = 5
    Vậy x = 5

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

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