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![](https://rs.olm.vn/images/avt/0.png?1311)
120+[55-(11-3.2)2]+12021
= 120+(55-25)+1
= 120+30-1
= 149
-329+(115-101)-(15-440)
= -329+14+425
= 100
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 2:
\(a,\Rightarrow x=-23+15=-8\\ b,\Rightarrow5\left(x+4\right)=85\\ \Rightarrow x+4=17\Rightarrow x=13\\ c,\Rightarrow5^{x+2}=24+1=25=5^2\\ \Rightarrow x+2=2\Rightarrow x=0\\ d,\Rightarrow x+4+x+5⋮9\\ \Rightarrow2x+9⋮9\\ \Rightarrow2x⋮9\Rightarrow x\in\left\{0;9\right\}\left(0< x< 10\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-329 (15-101) - (25-440)
= -329 . (-86) - ( -415)
= 28294 - ( -415)
= 28294 + 415
= 28709
![](https://rs.olm.vn/images/avt/0.png?1311)
(-329)+15+(-101)+440+(-25)
=(-314)+(-101)+440+(-25)
=(-415)+440+(-25)
=25+(-25)
=0
Trả lời :...................
0............................
Hk tốt...............
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-329+\left(15-101\right)-\left(25-440\right)\)
\(=\left(-329-101-25\right)+\left(15+440\right)\)
\(=-455+455=0\)