Question

5(7+48:x)=45

5^2x-3-2*5^2=5^2*3

2+x:5=6

10+2x=4^5:4^3

Answer 1

\(5\left(7+48:x\right)=45\)

 \(\Leftrightarrow\left(7+48x\right)=9\)

\(\Leftrightarrow4x=2\)

\(\Leftrightarrow x=2\)

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\(5^2x-3.2.5^2=5^2.3\)

\(\Leftrightarrow5x^2-3-2.5^2=75\)

\(\Leftrightarrow5x^2-3-50=75\)

\(\Leftrightarrow5x^2-3=125\)

\(\Leftrightarrow5x^2=128\)

\(\Leftrightarrow x^2=\frac{128}{5}\)

\(\Leftrightarrow\orbr{\begin{cases}x=\frac{128}{5}\\x=-\frac{128}{5}\end{cases}}\)

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\(2+x:5=0\)

\(\Leftrightarrow x:5=-2\)

\(\Leftrightarrow x=-10\)

\(10+2x=16\)

\(\Leftrightarrow2x=6\)

\(\Leftrightarrow x=3\)

Answer 2

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