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 7: x mũ 3 – 4/9 = 52/27 c,1/3*x mũ 2 + 2/9=22/27

Tháng Bảy 17, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: x mũ 3 – 4/9 = 52/27
c,1/3*x mũ 2 + 2/9=22/27

Comments ( 2 )

  1. maitrucloan
    maitrucloan
    17 Tháng Bảy, 2022 at 4:17 chiều
    Reply
    $x^3-\dfrac{4}{9}=\dfrac{52}{27}^{}$ 

    $⇒x^3=\dfrac{52}{27}+\dfrac{12}{27}^{}$ 

    $⇒x^3=\dfrac{64}{27}^{}$ 

    $⇒x^3=(\dfrac{8}{3})^{3}$ 

    $⇒x=\dfrac{8}{3}^{}$ 

    $\dfrac{1}{3}.x^2+\dfrac{2}{9}=\dfrac{22}{27}^{}$ 

    $⇒\dfrac{1}{3}.x^2=\dfrac{22}{27}-\dfrac{6}{27}^{}$ 

    $⇒\dfrac{1}{3}.x^2=\dfrac{16}{27}^{}$ 

    $⇒x^2=\dfrac{16}{27}:\dfrac{1}{3}^{}$ 

    $⇒x^2=\dfrac{16}{9}^{}$ 

    $⇒x^2=(±\dfrac{4}{3})^{2}$ 

    $⇒x=±\dfrac{4}{3}^{}$ 

  2. landinhngoc97
    landinhngoc97
    17 Tháng Bảy, 2022 at 4:17 chiều
    Reply
    x^3-4/9=52/27
    => x^3=52/27+4/9
    => x^3=52/27+12/27
    => x^3=64/27
    => x^3=(4/3)^3
    => x=4/3
    —–
    1/3x^2+2/9=22/27
    => 1/3x^2=22/27-2/9
    => 1/3x^2=22/27-6/27
    => 1/3x^2=16/27
    => x^2=16/27:1/3
    => x^2=16/27. 3
    => x^2=16/9
    => x^2 in {(4/3)^2; (-4/3)^2}
    => x in {4/3; (-4/3)}

Leave a reply

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

Thu Ánh

About Thu Ánh