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: 40x+56y=1.52 Mà x+y=0.3 (Giải thích)

Toán Lớp 8: 40x+56y=1.52
Mà x+y=0.3
(Giải thích)

Comments ( 2 )

  1. Em tham khảo:
         $\left \{ {{40x+56y=1,52} \atop {x+y=0,3}} \right.$ 
    ⇔ $\left \{ {{40x+56y=1.52} \atop {x=0,3-y}} \right.$ 
    ⇔ $\left \{ {{40.(0,3-y)+56y=1.52} \atop {x=0,3-y}} \right.$ 
    ⇔$\left \{ {{12-40y+56y=1.52} \atop {x=0,3-y}} \right.$
    ⇔$\left \{ {{16y=-10,48} \atop {x=0,3-y}} \right.$
    ⇔$\left \{ {{y=-0,655} \atop {x=0,3-y}} \right.$
    ⇔$\left \{ {{y=-0,655} \atop {x=0.955}} \right.$
    Học tốt

Leave a reply

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