27+12
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
(-12)+12+27-12-|-27|
= 0 + 27 - 12 - 27
= 27 - 27 - 12
= 0 - 12
= -12
![](https://rs.olm.vn/images/avt/0.png?1311)
=27.15-27.12-15.27+15.12
=-27.12+15.12
=12.(-27+15)
=12.(-12)
=-144
Cách 2
=27.3-15.15
=81-225
=-144
![](https://rs.olm.vn/images/avt/0.png?1311)
- \(\dfrac{4}{27}\) - \(\dfrac{7}{12}\) - \(\dfrac{23}{27}\) + \(\dfrac{17}{12}\)
= - (\(\dfrac{4}{27}\) + \(\dfrac{23}{27}\)) + (\(\dfrac{17}{12}\) - \(\dfrac{7}{12}\))
= - \(\dfrac{27}{27}\) + \(\dfrac{10}{12}\)
= -1 + \(\dfrac{5}{6}\)
= - \(\dfrac{6}{6}\) + \(\dfrac{5}{6}\)
= - \(\dfrac{1}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
27.(15-12)-15.(27-12)
= 27 . 15 - 27 . 12 - 15 . 27 - 15 . 12
= ( 27 . 15 - 15 . 27 ) - 12. ( 27 - 12 )
= 0 - 12 . 5
= 0 - 60
= -60
![](https://rs.olm.vn/images/avt/0.png?1311)
g) (15 + 37) + (52 – 37 – 17) = 15 + 37 + 52 – 37 – 17 = 15 + 52 – 17 = 50 h) (38 – 42 +14) - (38 – 42 - 15) = 38 – 42 +14 - 38 + 42 + 15 = 14 + 15 = 29 i) (27 + 65 ) + (346 - 27- 65) = 27 + 65 + 346 - 27- 65 = 346 k) - (27 + 65) - (346 – 27 - 65) = -27 - 65 - 346 + 27 + 65 = -346 l) (42 – 69 + 17) - (42 + 17) = 42 – 69 + 17 - 42 - 17 = – 69 m) 24. (16 - 5) – 16. (24 – 5 ) = 24. 16 - 24 . 5 - 16 . 24 + 16. 5 = - 24 . 5 + 16. 5 = -8 . 5 = -40 n) (-12). 47 – 12 . 52 + (-12) = -12 (47 - 52 + 1) = -12 . (-4) = 48 p) 51 . (69 - 25) – 69. (51 - 25) = 51 . 69 - 51 . 25 – 69. 51 + 69. 25 = - 51 . 25 + 69. 25 = (- 51+ 69).25 = 450 |
=39 đó bn
27 + 12 = 39 nha ban
ai thay dung thi h nha