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) 5-15-(-4+2)-7 b)-18:3-2.5-|-17| c)2.|x+1|-4=-2-(-12) d)3x/4-2=1,5.(x+75%) e) 1/3.(x-2 và 1/2)mũ 2 -2 và 3/4=-2

Tháng Hai 18, 2023 Toán học 2 Comments 0 views

Toán Lớp 6: a) 5-15-(-4+2)-7
b)-18:3-2.5-|-17|
c)2.|x+1|-4=-2-(-12)
d)3x/4-2=1,5.(x+75%)
e) 1/3.(x-2 và 1/2)mũ 2 -2 và 3/4=-2

Comments ( 2 )

  1. cattien
    cattien
    18 Tháng Hai, 2023 at 5:45 chiều
    Reply
    a) 5-15-(-4+2)-7
    = 5-15-(-2)-7
    = 5-15+2-7
    = -10+2-7
    = -8-7
    = -15
    b)-18:3-2.5-|-17|
    = -6-10-17
    = -16-7
    = 23
    c)2.|x+1|-4=-2-(-12)
    2.x+1-4=-2+12
    2.x+1-4=10
    2.x+1=10+4
    2.x+1=14
    2.x=14-1
    2.x=13
    x=13:2
    x=6,5
    d)(3x)/4-2=1,5.(x+75%)
    ⇔3/4x−2=3/2(x+3/4)
    ⇔3/4x−2=3/2x+9/8
    ⇔3/4x−3/2x=2+9/8
    ⇔−3/4x=25/8
    ⇔x=−25/6
    e)1/3.(x−2 1/2)^2−2 3/4=−2
    1/3.(x−5/2)^2−11/4 =−2
    1/3.(x−5/2)^2 =−2+11/4
    1/3.(x−5/2)^2 =3/4
    (x−5/2)^2 =3/4:1/3
    (x−5/2)^2 =9/4
    (x−5/2)^2 =3/(2^2)   hay    
    (x−5/2)^2=(−3/2)^2
    x−5/2 =3/2+5/2              x−5/2 =−3/2    
    x =4                                 x =−3/2+5/2
                                               x =1
    Vậy x=4 hay x=1 

  2. lanngocha
    lanngocha
    18 Tháng Hai, 2023 at 5:45 chiều
    Reply
    a)5−15−(−4+2)−7
    =5−15−(−2)−7
    =5−15+2−7
    =−10+2−7
    =−8−7
    =−15
    b)−18:3−2.5−|−17|
    =−6−10−17
    =−16−7
    =23
    c)2.|x+1|−4=−2−(−12)
    2.x+1−4=−2+12
    2.x+1−4=10
    2.x+1=10+4
    2.x+1=14
    2.x=14−1
    2.x=13
    x=13:2
    x=6,5
    d)(3x)/4−2=1,5.(x+75%)
    ⇔3/4x−2=3/2(x+3/4)
    ⇔3/4x−2=3/2x+9/8
    ⇔3/4x−3/2x=2+9/8
    ⇔−3/4x=25/8
    ⇔x=−25/6
    e)1/3.(x−2 1/2)^2−2 3/4=−2
    1/3.(x−5/2)^2−11/4=−2
    1/3.(x−5/2)^2=−2+11/4
    1/3.(x−5/2)^2=3/4
    (x−5/2)^2=3/4:1/3
    (x−5/2)^2=9/4
    (x−5/2)^2=3/(2^2) hay (x−5/2)^2=(−3/2)^2
    x−5/2=3/2+5/2              x−5/2=−3/2
    x=4                                 x=−3/2+5/2  
                                             x=1
    Vậy x=4 hay x=1
    color{red}{Rusian}
     

Leave a reply

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

Triều Nguyệt

About Triều Nguyệt