(x-5) x \(\frac{30}{100}\)= 200x : 100 + 5

(x-5) x \(\frac{3}{10}\)= 200x : 100 + 5

\(\frac{x.3-15}{10}\)= 2x + 5

\(\frac{x.3-15}{10}-2x=5\)

\(\frac{x.3-15}{10}-\frac{20x}{10}=5\)

\(\frac{3x-15-20x}{10}=5\)

3x - 20x - 15 = 50

-17x - 15 = 50

-17x = 65

x = 65 : -17

x = \(\frac{-65}{17}\)

=>3/10(x-5)=2x+5

=>3/10x-3/2=2x+5

=>-17/10x=5+3/2=6/2+3/2=11/2

=>x=-55/17

a) \(2^{x+2}-2^2=96\)

 <=> \(2^x.2^2-2^x=96\)

 <=> \(2^x\left(4-1\right)=96\)

<=> \(3.2^x=96\)

<=> \(2^x=32\)

<=> \(2^x=2^5\)

<=> x = 5 

b, \(x-\left(\frac{50x}{100}+\frac{25x}{200}\right)=11\frac{1}{4}\)

\(\Rightarrow x-\left(\frac{1x}{2}+\frac{1x}{8}\right)=\frac{45}{4}\)

\(\Rightarrow x-\left(\frac{4x}{8}+\frac{1x}{8}\right)=\frac{45}{4}\)

\(\Rightarrow x-\frac{5x}{8}=\frac{45}{4}\)

\(\Rightarrow\frac{8x}{8}-\frac{5x}{8}=\frac{45}{4}\)

\(\Rightarrow\frac{3x}{8}=\frac{45}{4}\Rightarrow x=\frac{45}{4}\div\frac{3}{8}=30\)

Vậy x = 30 

Nhìn nè

16.4^x=4^8

4^2.4^x=4^8

       4^x=4^8:4^2

       4^x=4^6 

==>x=6

còn câu tiếp

hoong bits lamf

\(\left(27+x\right):2+10=380+200\times5\)

\(\left(27+x\right):2+10=380+1000\)

\(\left(27+x\right):2+10=1380\)

\(\left(27+x\right):2=1380-10\)

\(\left(27+x\right):2=1370\)

\(27+x=1370\times2\)

\(27+x=2740\)

\(x=2740-27\)

\(x=2713\)

`#3107.101107`

\(( 27 + x ) \div 2 + 10 = 380 + 200\times 5\\ (27 +x) \div 2 + 10 = 380 + 1000 \\ (27 + x) \div 2 + 10 = 1380 \\(27 + x) \div 2= 1380 - 10 \\ (27 + x) \div 2 = 1370 \\ 27 + x = 1370\times 2 \\ 27 + x = 2740 \\ x = 2740 - 27 \\ x = 2713 \)

Vậy, `x = 2713.`

\((27+x):2+10=380+200\times5\\(27+x):2+10=380+1000\\(27+x):2+10=1380\\(27+x):2=1380-10\\(27+x):2=1370\\27+x=1370\times2\\27+x=2740\\x=2740-27\\x=2713\\Đáp.số:x=2713\)

tui o bít nhưng ai kb vs tui o