Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 6: a, 450 : [ 41 – ( 2x – 5) = `3^2` x 5 b, 96 – 3 x ( x + 8) = 42 c, 15 x 5 x ( x – 35) – 525 = 0 d, [ 3 x ( 70 – x) + 5] : 2 = 46 e, 250

Toán Lớp 6: a, 450 : [ 41 – ( 2x – 5) = 3^2 x 5
b, 96 – 3 x ( x + 8) = 42
c, 15 x 5 x ( x – 35) – 525 = 0
d, [ 3 x ( 70 – x) + 5] : 2 = 46
e, 250 : x + 10 = 20

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    a, 450 : [ 41 – ( 2x – 5 )] = 3^2 . 5
        450 : [ 41 – ( 2x – 5 )] = 9 . 5
                   41 – ( 2x – 5 ) = 450 : 45
                             2x – 5 = 41 – 10
                             2x = 31 + 5
                             x = 36 : 2
                             x = 18
    b, 96 – 3 . ( x + 8 ) = 42
                3 . ( x + 8 ) = 96 – 42
                       x + 8 = 54 : 3
                       x + 8 = 18
                       x = 18 – 8
                       x = 10
    c, 15 . 5 . ( x – 35 ) – 525 = 0
                     x – 35 = 525 : 75
                     x = 7 + 35
                     x = 42
    d, [ 3 . ( 70 – x ) + 5 ] : 2 = 46
          3 . ( 70 – x ) + 5 = 46 . 2
          3 . ( 70 – x ) = 92 – 5
                 70 – x = 87 : 3
                        x = 70 – 29
                        x = 41
    e, 250 : x + 10 = 20
        250 : x = 20 – 10
                 x = 250 : 10
                 x = 25 

  2. a) 450 : [ 41 – ( 2x – 5)] = 3^2 × 5
    => 450 : [ 41 – ( 2x – 5)] = 9 × 5
    => 450 : [ 41 – ( 2x – 5)] = 45
    => 41 – ( 2x – 5) = 10
    => 2x – 5 = 31
    => 2x = 36
    => x = 18
    Vậy x = 18
    b) 96 – 3 × ( x + 8) = 42
    => 3 × ( x + 8) = 54
    => x+8 = 18
    => x = 10
    Vậy x = 10
    c) 15 × 5 × ( x – 35) – 525 = 0
    => 75 × ( x – 35) = 525
    => x – 35 = 7
    => x = 42
    Vậy x = 42
    d) [ 3 × ( 70 – x) + 5] : 2 = 46
    => 3 × ( 70 – x) + 5 = 92
    => 3 × ( 70 – x) = 87
    => 70 – x = 29
    => x = 41
    Vậy x = 41
    e) 250 : x + 10 = 20
    => 250 : x = 10
    => x = 25
    Vậy x = 25
    (Chúc bạn học tốt)

Leave a reply

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

About Tuyết