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

Toán Lớp 8: bai 1: giai bpt a,( x-3) (x+5) ≥0 b, x(x-4) < 0

Toán Lớp 8: bai 1: giai bpt
a,( x-3) (x+5) ≥0
b, x(x-4) < 0

Comments ( 2 )

  1. Bạn tham khảo nhé( có gì không hiểu thì hỏi lại mình nhé )
    toan-lop-8-bai-1-giai-bpt-a-3-5-0-b-4-0

  2. a. $(x-3)$$.$$(x+5)$ $\geq$ $0$
    ⇔ \(\left[ \begin{array}{l}x-3\geq0\\x+5\geq0\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}x\geq3\\x-5\end{array} \right.\) 
    b. $x(x-4)$ $<$ $0$
    $Th1$:\(\left[ \begin{array}{l}x>0\\x$\geq$ -4<0⇔x<4\end{array} \right.\)
    $Th2$:\(\left[ \begin{array}{l}x<0\\x-4>0<=> x>4\end{array} \right.\) 
     

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

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