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1 . 56- (-23) =56+23 =79
2. 45- 67 = -22
3. -34-59 =-93
4. 81+(-41)=40
( + 56 ) - ( - 23 ) = 79
45 - 67 = -22
- 34 - 59 = - 93
81 + ( - 41 ) = 40
\(\frac{27}{23}+\frac{-4}{23}+\frac{1}{2}+\frac{-4}{8}< x< \frac{7}{3}+\frac{13}{41}+\frac{28}{41}\)
\(\Rightarrow\frac{27}{23}-\frac{4}{23}+\frac{1}{2}-\frac{4}{8}< x< \frac{7}{3}+\frac{13}{41}+\frac{28}{41}\)
\(\Rightarrow1+0< x< \frac{7}{3}+\frac{3}{3}\)
\(\Rightarrow1< x< \frac{10}{3}\)
\(\Rightarrow1< x< 3,333333333\)
\(\Rightarrow x\in\left\{2;3\right\}\)
Vậy : ....
ta co : \(\frac{27}{23}+\frac{-4}{23}+\frac{1}{2}+\frac{-4}{8}< x< \frac{7}{3}+\frac{13}{41}+\frac{28}{41}\)
=> \(1< x< \frac{10}{3}\)
vi x la so nguyen => \(1< x\le3\)
con lai ban tu lam
a: =-48+27+56-48-27-36
=-96+20
=-76
b: =23-57+57-33=-10
c: =-98+12-159-12-41
=-98-200
=-298
720 : [ 41 - ( 56 : x - 5 ) ] = 40
41 - ( 56 : x - 5 ) = 720 : 40
41 - ( 56 : x - 5 ) = 18
56 : x - 5 = 41 - 18
56 : x - 5 = 23
56 : x = 23 + 5
56 : x = 28
x = 56 : 28
x = 2
10 . [(56 - 23) + x] = 680
(56 - 23) + x = 680 : 10
(56 - 23) + x = 68
33 + x = 68
x = 68 - 33
x = 35
\(-56+\left|-x+23\right|=-41\)
\(\Leftrightarrow-56+\left|23-x\right|=-41\)
\(\Leftrightarrow\left|23-x\right|-56=-41\)
\(\Leftrightarrow\left|23-x\right|=15\)
\(\Leftrightarrow\orbr{\begin{cases}23-x=15\\23-x=-15\end{cases}\Leftrightarrow\orbr{\begin{cases}x=8\\x=38\end{cases}}}\)
Vậy \(x\in\left\{8;38\right\}\)
-56+|-x+23|=-41
|-x+23|=-41- (-56)
|-x+23|=-41+56
|-x+23|=15
=> \(\orbr{\begin{cases}-x+23=15\\-x+23=-15\end{cases}}\)
=>\(\orbr{\begin{cases}-x=15-23\\-x=-15-23\end{cases}}\)
=>\(\orbr{\begin{cases}-x=-8\\-x=-38\end{cases}}\)
=>\(\orbr{\begin{cases}x=8\\x=38\end{cases}}\)