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a)
Cách 1:
15.12 – 3.5.10
= 180 - 150 = 30
Cách 2: 15.12 – 3.5.10
= 15.12 – 15.10
= 15.(12 - 10)
= 15.2 = 30
b) Cách 1: 45 – 9.(13 + 5)
= 45 – 9.18
= 45 - 162
= -117
Cách 2: 45 – 9.(13 + 5)
= 9.5 – 9.13 – 9.5
= 9.5 – 9.5 – 9.13
= -9.13
= -117
c) Cách 1: 29.(19 - 13) – 19.(29 - 13)
= 29.6 – 19.16
= 174 – 304
= -130
Cách 2: 29.(19 - 13) – 19.(29 - 13)
= 29.19 - 29.13 - 19.29 + 19.13
= 29.19 - 29.19 - 29.13 + 19.13
= 13.(-29 + 19)
= 13.(-10)
= -130
![](https://rs.olm.vn/images/avt/0.png?1311)
a. C1: 15.12 - 3.5.10
= 15.12 - 15.10
= 15. (12 - 10)
= 15. 2
= 30
C2: 15.12 - 3.5.10
= 180 - 150
= 30
b. C1: 45 - 9.(13+5)
= 9.5 - 9.(13+5)
= 9.[5-(13+5)]
= 9.(5-13-5)
= 9.(-13)
= -117
C2: 45 - 9.(13+5)
= 45 - 9.18
= 45 - 162
= -117
c. C1: 29.(19-13) - 19.(29 - 13)
= 29.19 - 29.13 - 19.29 + 19.13
= 19.13 - 29.13
= (19-29).13
= -10.13
= -130
C2: 29.(19-13)-19.(29-13)
= 29.6-19.16
= 174 - 304
= -130
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Cách 1:
15.12-3.5.10
=180-15.10
180-150
=30
Cách 2:
15.12-3.5.10
=15.12-15.10
=15.(12-10)
=15.2
=30
b)45-9.(13+5)
=45-9.18
=45-162
=-117
Cách 2:
45-9.(13+5)
=45-9.13+9.5
=45-117+45
=45-162
=-117
c)Cách 1
29.(19-13)-19.(19-13)
=29.3-19.6
=87-114
=-27
Cách 2
29.(19-13)-19.(19-13)
=29.19-29.13-19.19-19.13
=551-377-377-3
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)15.12-3.5.10=180-150=30(c1)
15.12-3.5.10=15.12-15.10=15.(12-10)=15.2=30(c2)
b) 45-9.(13+5)=45-9.18=45-162=-117
45-9.(13+5)=45-9.13-9.5=45-45-117=0-117=-117
c)c,29.(19-13)-19.(29-13)=29.19-29.13-19.29+19.13=29.19-19.29-29.13+19.13=0-(29.13-19.13)=0-((29-19).13)=0-(10.13)=0-130=-130
![](https://rs.olm.vn/images/avt/0.png?1311)
a. C1: 15 . 12 - 3.5.10
= 15 . 12 - 15 . 10
= 15.(12 - 10)
= 15 . 2
= 30
C2: 15.12 - 3.5.10
= 15.2.6 - 3.5.2.5
= 30.6 - 30.5
= 30.(6 - 5)
= 30.1
= 30
b. C1: 45 - 9.(13 + 5)
= 45 - 9.13 - 9.5
= 45 - 117 - 45
= -117
C2: 45 - 9.(13 + 5)
= 45 - 9.18
= 45 - 162
= -117
c. C1: 29.(19 - 13) - 19.(29 - 13)
= 29.19 - 29.13 - 19.29 + 19.13
= (29.19 - 19.29) + 19.13 - 29.13
= 0 + 13.(19 - 29)
= 13.(-10)
= -130
C2: 29.(19 - 13) - 19.(29 - 13)
= 29.6 - 19.16
= 174 - 304
= -130
a)cách 1:
15.12-3.5.10
=180-15.10
=180-150
=30
cách 2:
15.12-3.5.10
=15.12-15.10
=15.(12-10)
=15.2
=30
b)45-9.(13+5)
=45-9.18
=45-162
=-117
45-9.(13+5)
=45-9.13+9.5
=45-9.13+45
=(45-45)-9.13
=0-117
=-117
c)29.(19-13)-19.(29-13)
=29.19-29.13-19.29-19.13
=(29.19-19.29)+(19.13-29.13)
=0+13.(19-29)
=0+13.(-10)
=-130
29.(19-13)-19.(29-13)
=29.6-19.16
=174-304
=-130
tick nha bn mk bị âm điểm
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
Cách 1:
15.12 – 3.5.10 = 180 - 150 = 30
Cách 2:
15.12 – 3.5.10 = 15.12 – 15.10 = 15.(12 - 10) = 15.2 = 30
b)
Cách 1:
45 – 9.(13 + 5) = 45 – 9.18 = 45 - 162 = -117
Cách 2:
45 – 9.(13 + 5) = 9.5 – 9.13 – 9.5 = 9.5 – 9.5 – 9.13
= -9.13 = -117
c)
Cách 1:
29.(19 - 13) – 19.(29 - 13) = 29.6 – 19.16 = 174 – 304 = -130
Cách 2:
29.(19 - 13) – 19.(29 - 13) = 29.19 - 29.13 - 19.29 + 19.13
= 29.19 - 29.19 - 29.13 + 19.13 = 13.(-29 + 19)
= 13.(-10) = -130
Cách 1:
a) 15.12-3.5.10
=180-150
=30
b) 45−9.(13+5)
=45-9.18
=45-162
=-117
c) 29.(19−13)−19.(29−13)
=29.6-19.16
=174-304
=-130
Cách 2.
a) 15.12−3.5.10
=15.12-15.10
=15.(12-10)
=30
b) 45−9.(13+5)
=45-9.13-45
=-117
c) 29.(19−13)−19.(29−13)
=29.19-29.13 - 19.29 - 19. -13
=-29.13 - 19. -13
=-13.(29-19)
=-130