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TÍnh nhanh
a) 32 - 13 - 17
= 32 - (13 + 17)
= 32 - 30
= 2
b) 45 - 12 - 5 - 23
= (45 - 5) - (12 + 23)
= 40 - 35
= 5
c) 1732 - 513 - 732
= (1732 - 732) - 513
= 1000 - 513
= 487
d) 2834 - 150 - 834
= (2834 - 834) - 150
= 2000 - 150
= 1850
a) 32 - 13 - 17
= 32 - (13 + 17)
= 32 - 30
= 2
b) 45 - 12 - 5 - 23
= 45 - (12 + 5 + 23)
= 45 - 40
= 5
c) 1732 - 513 - 732
= (1732 - 732) - 513
= 1000 - 513
= 487
d) 2834 - 150 - 834
= (2834 - 834) - 150
= 2000 - 150
= 1850
![](https://rs.olm.vn/images/avt/0.png?1311)
32 x 48 + 48 x 6 - 123 : 3
= 48 x ( 32 + 6) - 123 : 3
= 48 x 38 - 41
= 1824 - 41
= 1783
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 40 x 722 x 5
= (40 x 5 ) x 722
= 200 x 722
= 144400
b, 675 + 15 + 675 x 35 - 40 x 675
= 675 x ( 15 + 35 - 40 )
= 675 x 10
= 6750
c, 424 x 35 + 424 x 40 + 424 x 24 + 424
= 424 x 35 + 424 x 40 + 424 x 24 + 424 x 1
= 424 x ( 35 + 40 + 24 + 1 )
= 424 x 100
= 42400
![](https://rs.olm.vn/images/avt/0.png?1311)
456 + 675 + 244 - 375
= (456 + 244) + (675 - 375)
= 700 + 300
= 1000
Bài đó tính như sau:
456+675+244-375=(456+244)+(675-375)=
=700+300=1000
![](https://rs.olm.vn/images/avt/0.png?1311)
325 + 1268 + 332 + 675
= (325 + 675) + (1268 + 332)
= 1000 + 1600
= 2600
HT
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (675 + 325) x 42
= 675 x 42 + 325 x 42
= 28350 + 13650
=42000
(675 + 325) x 42
= 1000 x 42
= 42000
b, 36 x ( 196 - 96)
= 36 x 100
= 3600
36 x ( 196 - 96)
= 36 x 196 - 36 x 96
= 7056 - 3456
= 3600
\(675:32=21,09375\)
\(1732:123=14,08130081\)
675 : 32 = 21 ( dư 3 )
1732 : 123 = 14 ( dư 10 )