Câu hỏi của Nghiêm Minh Hằng

Question

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Nguyễn Hoàng Minh · Accepted Answer

$c,\Rightarrow234-x^2+5=230\Rightarrow x^2=9\Rightarrow\left[{}\begin{matrix}x=3\x=-3\end{matrix}\right.$

$d,\Rightarrow44\left(3^{x+1}-3^5\right)=0\ \Rightarrow3^{x+1}-3^5=0\ \Rightarrow3^{x+1}=3^5\Rightarrow x+1=5\Rightarrow x=4\ e,\Rightarrow\left(x+1\right)\left(x+2\right)=666\cdot667\Rightarrow x+1=666\Rightarrow x=665\ f,\Rightarrow\left(3-x\right)^{15x-30}=1=1^{15x-30}\ \Rightarrow3-x=1\Rightarrow x=2$

Câu trả lời:

$c,\Rightarrow234-x^2+5=230\Rightarrow x^2=9\Rightarrow\left[{}\begin{matrix}x=3\x=-3\end{matrix}\right.$

$d,\Rightarrow44\left(3^{x+1}-3^5\right)=0\ \Rightarrow3^{x+1}-3^5=0\ \Rightarrow3^{x+1}=3^5\Rightarrow x+1=5\Rightarrow x=4\ e,\Rightarrow\left(x+1\right)\left(x+2\right)=666\cdot667\Rightarrow x+1=666\Rightarrow x=665\ f,\Rightarrow\left(3-x\right)^{15x-30}=1=1^{15x-30}\ \Rightarrow3-x=1\Rightarrow x=2$

Lấp La Lấp Lánh · Answer

c) $234-30^0\left(x^2-5\right)=230$

$\Rightarrow234-x^2+5=230$

$\Rightarrow x^2=9\Rightarrow x=\pm3$

d) $\Rightarrow44\left(3^{x+1}-3^5\right)=0$

$\Rightarrow3^{x+1}-3^5=0$

$\Rightarrow3^{x+1}=3^5$

$\Rightarrow x+1=5\Rightarrow x=4$

e) $\left(x+1\right)\left(x+2\right)=444222$

$\Rightarrow\left(x+1\right)\left(x+2\right)=666.667$

$\Rightarrow\left\{{}\begin{matrix}x+1=666\x+2=667\end{matrix}\right.$$\Rightarrow x=665$

f) $\left(3-x\right)^{15x}:\left(3-x\right)^{30}=1\left(x\ne3\right)$

$\Rightarrow\left(3-x\right)^{15x-30}=1$

$\Rightarrow15x-30=0\Rightarrow15x=30\Rightarrow x=2\left(tm\right)$