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

Toán Lớp 7: Tìm x 1. 2x^2 + 4x = 0 2. (3+x) . (2x-5) > 0

Toán Lớp 7: Tìm x
1. 2x^2 + 4x = 0
2. (3+x) . (2x-5) > 0

Comments ( 2 )

  1. Mik gửi nha
    Bn thông cảm chữ mik khá là xấu
    Chắc ko dc ctlhn nên bn cho mik 5 sao + 1 tim nha
    toan-lop-7-tim-1-2-2-4-0-2-3-2-5-0

    1)2x^2 + 4x = 0$\\$<=>2x(x+2)=0$\\$<=>\(\left[ \begin{array}{l}2x=0\\x+2=0\end{array} \right.\) <=>\(\left[ \begin{array}{l}x=0\\x=-2\end{array} \right.\)
    2) (3+x) . (2x-5) > 0 $\\$<=>\(\left[ \begin{array}{l}3+x>0\\2x-5>0\end{array} \right.\) <=>\(\left[ \begin{array}{l}x<-3\\x>5/2\end{array} \right.\)

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