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

Toán Lớp 6: (X+10)²-16 5 mũ x +5;mũ x +2=650

Toán Lớp 6: (X+10)²-16
5 mũ x +5;mũ x +2=650

Comments ( 1 )

  1. $\text{a)(x+10)²=-16}$
    $\text{⇒(x+10)²=-4²}$
    $\text{⇒x+10=-4}$
    $\text{⇒x=(-4)-10}$
    $\text{⇒x=-14}$
    $\text{Vậy x=-14}$
    b)$5^x$+5^{x+2}=650
    $\text{⇒$5^x$+$5^x$+25=650}$
    $\text{⇒$5^x$·(1+25)=650}$
    $\text{⇒$5^x$+26=650}$
    $\text{⇒$5^x$=650:26}$
    $\text{⇒$5^x$=25}$
    $\text{⇒$5^x$=25}$
    $\text{⇒$5^x$=5²}$
    $\text{⇒x=2}$
    $\text{Vậy x=2}$
     

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