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1. \(x-\left(-12,6\right)=8,7+6,3\)
\(\Rightarrow x=8,7+6,3+\left(-12,6\right)=2,4\)
2. \(x-5,67x+3,42x=16,75\)
\(\Rightarrow x\left(1-5,67+3,42\right)=16,75\)
\(\Rightarrow x.\left(-1,25\right)=16,75\)
\(\Rightarrow x=\dfrac{16,75}{-1,25}=-13,4\)
3. \(60\)
4. \(1000\)
5. \(883000\)
6. \(8\)
7. \(10\)
8. \(1,3\)
9. \(1,46\)
10. \(61\)
11. \(1,4\)
12. \(4,8\)
\(x+x\div5=12,6\)
\(x\times\left(1+\frac{1}{5}\right)=12,6\)
\(x\times\frac{6}{5}=12,6\)
\(x=12,6\div\frac{6}{5}=\frac{12,6\times5}{6}\)
\(\Rightarrow x=10,5\)
x + x . \(\frac{1}{5}\)= 12,6
x . ( 1 + 1/5) = 12,6
x . 1,2 = 12,6
x = 1,05
\(\left|-x-3,2\right|+5,4=\)\(12,6\)
<=> \(\left|-x-3,2\right|=7,2\)
<=> \(\hept{\begin{cases}-x-3,2=7,2\\-x-3,2=-7,2\end{cases}}\)
<=> \(\hept{\begin{cases}-x=10,4\\-x=-4\end{cases}}\)
<=> \(\hept{\begin{cases}x=10,4\\x=4\end{cases}}\)
a)X + 18,7= 50, 5 :2,5
X +\(\frac{187}{10}\)=\(\frac{505}{10}\):\(\frac{25}{10}\)
X + \(\frac{187}{10}\)=\(\frac{101}{2}:\frac{5}{2}\)
\(X+\frac{187}{10}=\frac{101}{2}\times\frac{2}{5}\)
\(X+\frac{187}{10}=\frac{101}{5}\)
\(X=\frac{101}{5}-\frac{187}{10}\)
\(X=\frac{202}{10}-\frac{187}{10}\)
\(X=\frac{15}{10}\)
\(X=\frac{3}{2}\)
`a)19,75+6,3=34,25-x:0,4`
`x:0,4=34,25-19,75-6,3`
`x:0,4=8,2`
`x=8,2xx0,4=3,28`
________________________________________________
`b)20,2xx4,3=x xx12,5-88,64`
`x xx12,5=20,2xx4,3+88,64`
`x xx12,5=86,86+88,64=175,5`
`x=175,5:12,5`
`x=14,04`
a: 34,25-x:0,4=19,75+6,3
=>x:0,4=8,2
hay x=3,28
b: =>12,5x-88,64=20,2x4,3
=>12,5x=175,5
hay x=14,04
\(\frac{17,8.3,7-7,8.4,8+5,7.17,8-4,6.7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)
\(=\frac{17,8\left(3,7+5,7\right)-7,8\left(4,8+4,6\right)}{\left(13,4-12,6\right)+\left(12,3-11,5\right)+\left(11,2-10,4\right)}\)
\(=\frac{17,8.9,4-7,8.9,4}{0,8+0,8+0,8}\)
\(=119,1\)
x + 2,57 = 14,25 -6,3
x + 2,57 = 7,95
x = 7,95 - 2,57
x = 5,38
b, 12,9-x = 4,2 +2,4
12,9-x = 6,6
x = 12,9 - 6,6
x= 6,3
c, x . 93 + x . 0,7 = 100
x . (93 + 0,7 ) = 100
x . 93,7 = 100
x= 100 : 93,7
x= 1000/ 937
d, \(\dfrac{x}{5}=\dfrac{4}{2}\) = \(\dfrac{x}{5}=2\)
x : 5 = 2
x= 2.5
x= 10
a) x + 2,57 = 14,25 - 6,3 ; b) 12,9 - x = 4,2 + 2,4
x = 7,95 - 2,57 x = 12,9 - 6,6
x = 5,38 x = 6,3
c) 93x + 0,7x = 100 ; d) x/5 = 4/2
(93 + 0,7)x = 100 x = 2 x 5
x = 100/93,7 x = 10
=>6,72-x=-6,3
=>x=13,02
\(\text{6,72-x=(-12,6)+6,3 }\)
\(\text{6,72-x=-6,3}\)
\(\text{ x=13,02}\)