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 8: c)2x(9x-4)-9x(2x-3)=-38 d)(5-2x)(x-1)+2x(x-1)=-14 e)(3+x^2)-x(x-2)=0

Toán Lớp 8: c)2x(9x-4)-9x(2x-3)=-38
d)(5-2x)(x-1)+2x(x-1)=-14
e)(3+x^2)-x(x-2)=0

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
     c, 2x(9x-4)-9x(2x-3)=0
    <=> 18x^2 -8x-18x^2+27x=0
    <=> 19x=0
    <=>x=0
    d, (5-2x)(x-1)+2x(x-1)=-14
    <=> 5x-5-2x^2+2x+2x^2-2x=-14
    <=> 5x = -9
    <=> x=-9/5
    Vậy x=-9/5
    e, (3+x^2 – x(x-2)=0
    <=> 3+x^2 -x^2+2x=0
    <=>2x=-3
    <=> x=-3/2
    Vậy x=-3/2

Leave a reply

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