Làm cho mk bài 3 ý c,d . Nhanh nhé mn

Làm cho mk bài 3 ý c,d . Nhanh nhé mn
lam-cho-mk-bai-3-y-c-d-nhanh-nhe-mn

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  1. `c,` `116-x^2=3^6:3^3+4^3. 1^10`

    `⇒116-x^2=3^3+4^3`

    `⇒116-x^2=91`

    `⇒x^2=25`

    `⇒x=±5`

    `d,` `3^x+3^{x+2}=10^2-4^2+2.3`

    `⇒3^x.(1+3^2)=100-16+6`

    `⇒3^x.10=90`

    `⇒3^x=9`

    `⇒3^x=3^2`

    `⇒x=2`

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