Câu 1: Tính : 23+(-45)
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1) 23 . 45 + 23 . 55 - 23
= 23 . (45 + 55 - 1)
= 23 . 99
= 2277
2) 2349 : 21 + {67 . 13 + [23 + 45 - (45 + 2)]}
= 2349 : 2 + {67 . 1 + [68 - (45 + 2)]}
= 1174,5 + {67 + [68 - 47]}
= 1174,5 + {67 + 21}
= 1174,5 + 88
= 1262,5
3) 23 + 3 . 9 + 56
= 23 + 27 + 56
= 50 + 56
= 106
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\(\frac{17}{45}+\frac{13}{45}+\frac{28}{45}+\frac{1}{27}+\frac{26}{27}+\frac{22}{45}\)
= \(\left(\frac{17}{45}+\frac{28}{45}\right)+\left(\frac{1}{27}+\frac{26}{27}\right)+\left(\frac{23}{45}+\frac{22}{45}\right)\)
= 1 + 1 + 1
= 3
![](https://rs.olm.vn/images/avt/0.png?1311)
1 2 + − 1 2 + − 2 3 + 2 3 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0
1 2 + − 1 2 + − 2 3 + 2 3 + 3 4 + − 3 4 + − 4 5 + 4 5 + 5 6 + − 5 6 = 0
Đây nha
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
17/45+23/45+28/45+1/27+26/27+22/45
=(17/45+23/45+28/45+22/45)+(1/27+26/27)
=2+1
=3
= 23 - 45
= -45 +23
= 22
~HT~
23 + (-45) = -22
k mik nha