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=>x-3/10=1/3 hoặc x-3/10=-1/3
=>x=19/30 hoặc x=-1/30
0,3-x=(+-1/3)
=>TH1) 0,3-x=1/3 TH2)0,3-x= (-1/3)
x=0,3 -1/3 x= 0,3 - (-1/3)
x= -1/30 x= 19/30
\(x-\dfrac{4}{3}=0,3\)
\(x-\dfrac{4}{3}=\dfrac{3}{10}\)
\(x=\dfrac{3}{10}+\dfrac{4}{3}\)
\(x=\dfrac{49}{30}\)
\(\frac{\left(0,6\right)^5.\left(0,3\right)^3}{\left(0,2\right)^6.\left(0,3\right)^7}\)
\(=\frac{\left(\frac{6}{10}\right)^5.\left(\frac{3}{10}\right)^3}{\left(\frac{2}{10}\right)^6.\left(\frac{3}{10}\right)^7}\)
\(=\frac{6^5.3^3.\frac{1}{10^8}}{2^6.3^7.\frac{1}{10^{13}}}\)
\(=\frac{2^5.3^5.3^3}{2^6.3^7.\frac{1}{10^5}}\)
\(=\frac{10^5.3}{2}\)
\(=150000\)
\(N=-\dfrac{3}{10}\cdot\dfrac{3}{7}+\dfrac{5}{2}-\dfrac{1}{27}=-\dfrac{9}{70}+\dfrac{5}{2}-\dfrac{1}{27}=\dfrac{2206}{945}\)
3./2:x/ .2 = 20
3./2:x/ = 20:2 = 10
/2:x/ = \(\frac{10}{3}\)
\(\Leftrightarrow\orbr{\begin{cases}2:x=\frac{10}{3}\\2:x=\frac{-10}{3}\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{3}{5}\\x=\frac{-3}{5}\end{cases}}\)
Vậy....................................................
0,275-0,3+3/11+3/12-0,625+0,5-5/11-5/12
=11/14-3/10+3/11+3/12-5/8+1/2-5/11-5/12
=(11/14+1/2)-3/10-5/8+(3/11+3/12)+(-5/11-5/12)
=9/7-37/40+[3(1/11+1/12)]+[5(-1/11-1/12)]
=1/280+3+5
=1/280+8
=2441/280
=
4/4/9=2/3:[0,1.x]
0,1.x=2/3:4/4/9 [ chuyen ve]
0,1.x=3/20
x=3/20:0,1
x=3/2
`(0,3)^{3}.70^{3}`
`=(0,3.70)^{3}`
\(=\left(\dfrac{3}{10}.70\right)^3\\ =\left(3.7\right)^3=21^3=9261\)
\(\left(0,3\right)^3\times70^3\\ =\left(0,3\times70\right)^3\\ =21^3\)