-257.23+23.157-63
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![](https://rs.olm.vn/images/avt/0.png?1311)
23.157 + 15.46 - 28.87
= 23 . 157 + 15.2.23 - 28.87
= 23 . ( 157 + 30) - 2436
= 4301 -2436
= 1865
23.157 + 15.46 - 28.87 = 9,747
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a) 93.85+17.45-170=8500
b) 491.(267+53) -491. (153+67) =49100
c) 45.48-90.24+145=145
d) 754.75-2262.25+4568=4568
e) 23.157+15.46 -23.87=2300
![](https://rs.olm.vn/images/avt/0.png?1311)
23 x 157 + 46 x 15 - 23 x 87 = 23 x 157 + 23 x 2 x 15 - 23 x 87
= 23 x 157 + 23 x 30- 23 x 87
= 23 x (157 + 30 - 87 )
= 23 x 100
= 2300
Chúc bạn hok tốt nha!@
Ta có:
23.157+46.15-23.87
=23.157+23.(2.15)-23.87
=23.(157+30-87)
=23.100
=2300
![](https://rs.olm.vn/images/avt/0.png?1311)
=491.267+491.53-491.153+491.67
=491.(267+153)-491.(53+67)
=491.420-491.120
=491.(420-120)
=491.300
=147300
45.48-90.24+145
=(45.2).(48:2)-90.24+145
=90.24-90.24+145
=0+145
=145
754.75-2262.25+4568
=754.75-(2262:3).(25.3)+4568
=754.75-754.75+4568
=0+4568
=4568
23.157+15.46-23.87
=23.(147-87)+15.46
=23.60+15.46
=23.60+(15.2).(46:2)
=23.60+50.23
=23.(60+50)
=23.110
=2530
![](https://rs.olm.vn/images/avt/0.png?1311)
\(63\cdot25+5\cdot63+63\cdot14+63\cdot33\)
\(=63\cdot\left(15+5+14+33\right)\)
\(=63\cdot67\)
\(=4221\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-87.63+63.\left(-14\right)+63=63.\left(-87+\left(-14\right)+1\right)\)
\(=63.\left(-100\right)\)
\(=-6300\)
= -87*63+63*(-14)+63
= [(-87)+(-14)+1]*63
= (-100)*63
= -6300
![](https://rs.olm.vn/images/avt/0.png?1311)
Chọn `A.\sqrt{36}+\sqrt{63}>10`
Vì `\sqrt{63}>\sqrt{16}=4`
`=>\sqrt{36}+\sqrt{63}>6+4=10`
= -297.073
- 257 . 23 + 23 . 157 - 63
= ( - 257 . 23 + 23 . 157) - 63
= 23 (- 257 + 157) - 63
= 23 . (-100) - 63
= - 2300 - 63
= - 2363