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17.85+25.17-1200
=17.(85+25)-1200
=17.110-1200
=1870-1200=670
745-5(120-74)-70
= 745-5.46-70
=745-230-70
=445
27.332+93.43+57.61+69.57
=8964+3999+57(61+69)
=12963+57.130
=12963+7410=20373
34.75+75.66-65.100
=75(34+66)-65.100
=75.100-65.100
=100(75-65)
=100.10= 1000.
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1là : -1156.98
Câu 2 là:450
Câu 3 là :247.942
Câu 4 là :45.31
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a) \(17\cdot85+15\cdot17-120\)
\(=17\cdot\left(85+15\right)-120\)
\(=17\cdot100-120\)
\(=1700-120\)
\(=1580\)
b) \(27\cdot77+24\cdot27-27\)
\(=27\cdot\left(77+24-1\right)\)
\(=27\cdot100\)
\(=2700\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(3.5^2-16:2^2\)
\(=3.25-16.4\)
\(=75-64\)
\(=11\)
b) \(17.85+15.17-120\)
\(=17.\left(85+15\right)-120\)
\(=17.100-120\)
\(=1700-120\)
\(=1580\)
c) \(\left(3^{15}.4+5.3^{15}\right):3^{16}\)
\(=\left[3^{15}.\left(4+5\right)\right]:3^{16}\)
\(=\left[3^{15}.9\right]:3^{16}\)
\(=\left[3^{15}.3^2\right]:3^{16}\)
\(=3^{17}:3^{16}\)
\(=3\)
a. 3.52 - 24 : 22 = 3.52- 22 = 3.25-4= 75-4 =71
b. 17.(85+15) - 120 = 17.100-120=1700-120=1580
c. |315.(4+5)| :316= (315.9) : 316= 315.32 : 316= 317:316=3
dấu | là ngoặc vuông bn nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
\(117.\left(-25\right)+25.17\)
\(=\left(-117\right).25+25.17\)
\(=25.\left[\left(-117\right)+17\right]\)
\(=25.\left(-100\right)\)
\(=-2500\)
![](https://rs.olm.vn/images/avt/0.png?1311)
17.( 85+15)-120=15.100-120=1500 -120=1380
Bạn gom số lại là được nhé tick nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 5 . 2 2 - 18 : 3 2
= 5.4 – 18:9
= 20 – 2 = 18
b, 17.85+15.17 – 120
= 1445+255 – 120
= 1580
c, 2 3 . 17 - 2 3 . 14
= 2 3 . ( 17 - 14 ) = 8.3 = 24
d, 20 – [30 – 5 - 1 2 ]
= 20 – (30 – 16) = 6
a)
17.85+25.17+81.100
=17.(85+25) +81.100
=17.110+81.100
=1870+8100
=9970
Ta có : 17. 85 +25. 17 + 81.100
= 17 . (85 + 25) + 81 . 100
= 17 . 110 + 81 . 100
= 17.(10 + 100) + 81 . 100
= 170 + 17 . 100 + 81 . 100
= 170 + [100 .( 17 +81)]
= 170 + 100 . 98
= 9800 + 170 =9970 .
Mik chắc đúng đấy , tick mik nha Nguyễn Hoàng Nina
= 251 . 100 = 25100 .