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a) 25.69+31.25-25.6
= 25.(69+31-6)
= 25.94
= 2350
b) 198:[130-(27-19)2]+20210
= 198:[130-82]+1
= 198:(130-64)+1
= 198:66+1
= 3+1
= 4
c) 520:[515.(15+10)]
= 520:[515.25]
= 520:(515.52)
= 520: 517
= 53
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =25x100-150=2500-150=2350
c: \(=520:\left\{515\cdot25\right\}\)
=104/2575
![](https://rs.olm.vn/images/avt/0.png?1311)
198 : [130 – (27 – 19 )^2] + 2021^0
= 198: [130 - 8^2] + 1
= 198 :( 130- 64) +1
= 198: (66) +1
= 3+1=4
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1)tính
a)\(-18+\left(-19\right)+27\)
\(=-18-19+27\)
\(=-\left(18+19\right)+27\)
\(=-37+27\)
\(=-\left(37-27\right)\)
\(=-10\)
b)\(-198-194+286\)
\(=-\left(198+194\right)+286\)
\(=-392+286\)
\(=-\left(392-286\right)\)
\(=-6\)
c)\(-19-\left(-17\right)\)
\(=-19+17\)
\(=-\left(19-17\right)\)
\(=-2\)
d)\(-48+\left(-47\right)-\left(-15\right)\)
\(=-48-47+15\)
\(=-\left(48+47\right)+15\)
\(=-95+15\)
\(=-\left(95-15\right)\)
\(=-80\)
e)\(23-\left(-16\right)+\left(-80\right)\)
\(=23+16-80\)
\(=39-80\)
\(=-80+39\)
\(=-\left(80-39\right)\)
\(=-41\)
f)\(99-\left(-99\right)-198\)
\(=99+99-198\)
\(=198-198\)
\(=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= 198 : [130 - 64 ] +1
= 198 : 66 + 1
= 3 + 1
= 4
Dạ em cảm ơn ạ