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Bài 1:
a, 58.32 + 58.68 - 800
= 58.(32 + 68) - 800
= 58.100 - 800
= 5800 - 800
= 5000
b, 12020 + 280 : [55 - (7 - 4)3]
= 12020 + 280 : [ 55 - 33 ]
= 12020 + 280 : [ 28]
= 12020 + 10
= 12030
c, (96 - 19 - 45) - (55 + 96 - 119)
= 96 - 19 - 45 - 55 - 96 + 119
= (96 - 96) + (119 - 19) - (45 + 55)
= 0 + 100 - 100
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
c) 5 8 : 5 6 + 2 2 . 3 3 - 2010 0 = 52 + 4 . 27 – 1 = 25 + 108 – 1 = 132
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3 8 + − 5 8 − 1 8 = 3 − 5 − 1 8 = − 3 8
b) 3 4 − − 1 2 + 1 6 = 9 12 + 6 12 + 2 12 = 17 12
![](https://rs.olm.vn/images/avt/0.png?1311)
2 7 − 3 8 + 11 7 − − 1 3 + 1 7 − 5 8 = 14 7 − 8 8 + 1 3 = 4 3 .
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1:
a. $=-(35+65)+(22+88)=-100+110=110-100=10$
c. $=58(26+74)=58.100=5800$
b. $=29(38+63-1)=29.100=2900$
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a/ ( 11.4.13415.4):(11.13.15)
= (11.15.13:11.1315).4.4.4
=1.4.4.4
=64
b/(168.168-168,58):110
=168.(168-58);110
=168.110:110
=168
c/(27.45-27.55):(2+4+6+...+18)
45-58+(-45)-|-58|-3
=45-58-45-58-3
=(45-45)-(58+58)-3
=0-116-3
=-119
tk cho mk nha!
bằng
45-58+(-45)-58-3
=[45+(-45)]+[-58+58] -3
=0+0-3
=-3