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

Toán Lớp 7: b)(xmũ3)+5)(xmũ3)+10)(xmũ3)+15)(xmũ3)+15)<0

Toán Lớp 7: b)(xmũ3)+5)(xmũ3)+10)(xmũ3)+15)(xmũ3)+15)<0

Comments ( 1 )

  1. $\text{Giải đáp+Lời giải và giải thích chi tiết:}$
    $b) (x³+5)(x³+10)(x³+15)(x³+15)<0$
    $⇔ (x³+15)²(x³+5)(x³+5)+5(x³+5)(x³+15)²<0$
    $⇔ (x³+15)²(x³+5)²+5(x³+5)(x³+15)²<0$
    Mà $(x³+15)²(x³+5)²≥0$
    $⇒ 5(x³+5)(x³+15)²<0$
    Mà $5(x³+15)≥0 ⇒ x³+5<0$
    $⇔ x³<-5$
    $⇔ x<$ $-\sqrt[3]{5}$ 

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