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a,27.75+25.27-150
=27.(75+25)-150
=27.100-150
=2700-150
=2550
c,13.17-256:16+14:7-1
=221-16+2-1
=205+2-1
=208-1
=207
d,18:3+182+3.(51:17)
=18:3+182+3.3
=6+182+9
=188+9
=197
e,15-25:8(100.2)
=15-25:8.200
=15-3,125.200
=15-625
=-610
f,25.8-12.5+170:17-8
=200-60+10-8
=140+10-8
=150-8
=142
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 40.113.25 – 20.112.50 = 40.25.113 – 20.50.112
= 1000.113 – 1000.112 = 1000(113 – 112) = 1000.1 = 1000
b) 27 + 27.5 + 27.7 – 27.2 = 27.(1 + 5 + 7 – 2) = 27.11 = 297
c) 754.75 – 25.2262 + 4568 = 754.75 – 25.3.754 + 4568
= 754.75 – 75.754 +4568 = 754.(75 – 75) + 4568 = 4568
![](https://rs.olm.vn/images/avt/0.png?1311)
27.75 + 25.27 - 150 = 27.(75 + 25) - 150 = 27.100 - 150 = 2700 - 150 = 2550
27 . 75 + 25 . 27 - 150
= 27 . ( 75 + 25 ) - 150
= 27 . 100 - 150
= 2700 - 150
= 2550
![](https://rs.olm.vn/images/avt/0.png?1311)
27.75 + 25.27 – 150
= 27(75 + 25) - 150
= 27.100 - 150
= 2700 - 150
= 2550
hoặc
27.75 + 25.27 - 150
= 2025 + 675 - 150
= 2700 - 150
= 2550
![](https://rs.olm.vn/images/avt/0.png?1311)
\(27.75+25.27-150\)
\(=27.\left(75+25\right)-150\)
\(=27.100-150\)
\(=2700-150\)
\(=2550\)
27 . 75 + 25 . 27 - 150
= 27 . ( 75 + 25 ) - 150
= 27 . 100 - 150
= 2700 - 150
= 2550
![](https://rs.olm.vn/images/avt/0.png?1311)
a/ 215 + [170 -(215+170)]
= 215 +[170 - 215 - 170]
= 215 + 170 - 215 - 170
= (215 - 215) + (170 - 170) = 0
b/ (-371)- [(-371 + 29) - 229]
= (-371) - [-371 + 29 - 229]
= (-371) + 371 - 29 + 229
= (-371 + 371) + (-29 + 229)
= 0 + 200 = 200
c/ (18 + 39) + ( 158 - 39 - 18)
= 18 + 19 + 158 - 39 - 18
= (18 - 18) + (19 - 39) + 158
= 0 - 20 + 158 = 138
d/ 25 + [-37 - 25 + (-63)]
= 25 + [-37 - 25 - 63]
= 25 - 37 - 25 - 63 = (25 - 25) + (37 - 63)
= 0 - 26 = -26
27.75+27.7:25-170
=27.75+27.0,28-170
=27.(75+0,28)-170
=27.75,28-170
=2030,56-170
=1862,56