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 5: Tính nhanh: a, (1 + $\dfrac{1}{2}$) x (1 + $\dfrac{1}{3}$) x (1 + $\dfrac{1}{4}$) b, X * $\dfrac{1}{2}$ + $\dfrac{3}{2 }$ * x = $\dfra

Home/ Toán Lớp 5: Tính nhanh: a, (1 + $\dfrac{1}{2}$) x (1 + $\dfrac{1}{3}$) x (1 + $\dfrac{1}{4}$) b, X * $\dfrac{1}{2}$ + $\dfrac{3}{2 }$ * x = $\dfra

Toán Lớp 5: Tính nhanh: a, (1 + $\dfrac{1}{2}$) x (1 + $\dfrac{1}{3}$) x (1 + $\dfrac{1}{4}$) b, X * $\dfrac{1}{2}$ + $\dfrac{3}{2 }$ * x = $\dfra

Tháng Bảy 4, 2022 Toán học 2 Comments 0 views

Toán Lớp 5: Tính nhanh:
a, (1 + $\dfrac{1}{2}$) x (1 + $\dfrac{1}{3}$) x (1 + $\dfrac{1}{4}$)
b, X * $\dfrac{1}{2}$ + $\dfrac{3}{2 }$ * x = $\dfrac{4}{5}$

Comments ( 2 )

  1. quynhmaithu
    quynhmaithu
    4 Tháng Bảy, 2022 at 8:23 sáng
    Reply
    a) ( 1 + 1/2) xx ( 1 + 1/3) xx ( 1 + 1/4)
    = ( 2/2 + 1/2) xx ( 3/3 + 1/3) xx ( 4/4 + 1/4)
    = 3/2 xx 4/3 xx 5/4
    = ( 3 xx 4 xx 5)/( 2 xx 3 xx 4)
    = ( 1 xx 1 xx 5)/(2 xx 1 xx 1)
    = 5/2
    b) x xx 1/2 + 3/2 xx x = 4/5
    x xx ( 1/2 + 3/2) = 4/5
    x xx 2 = 4/5
    x = 4/5 : 2
    x = 2/5
    Vậy x = 2/5
    #caty09
     

  2. dongoclandiem
    dongoclandiem
    4 Tháng Bảy, 2022 at 8:23 sáng
    Reply
    a, ( 1 + 1/2 ) \times  (1 +1/3 ) \times ( 1 + 1/4 )
    = 3/2  \times 4/3  \times 5/4
    = (3 \times 4 \times 5)/( 2 \times 3 times 4)
    = 5/2
    b, x \times 1/2 + 3/2  \times x = 4/5
    x  \times ( 1/2 + 3/2 ) = 4/5
    x \times 2 = 4/5
    x = 4/5 : 2
    x = 4/5 \times 1/2
    x = 2/5
     

Leave a reply

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

Quỳnh Ngân

About Quỳnh Ngân