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100 - x = 200 - 150
100 - x = 50
x = 100 - 50
x = 50
tk mk mk tk lại
![](https://rs.olm.vn/images/avt/0.png?1311)
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B. 173 + 45 + 135 + 27 + 50
= (173+27) + (45 +135) +50
=200 + 180 + 20 + 30
= 200 +200 +30
=430
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b, 53 + 45 + 135 + 147 + 50
= ( 53 + 147 ) + ( 45 + 135 ) + 50
= 200 + 180 + 50
= 200 + 330
= 530
b, 53 + 45 + 135 + 147 + 50
=(53+147)+(45+135+50)
=200+230
=430
![](https://rs.olm.vn/images/avt/0.png?1311)
x+85=100
x=100-85
x=15
x-24=45
x-24=45
x=45+24
x=69
x.5=35
x=35:5
x=7
x:2=5
x=5.2
x=10
HT
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a) 27 . 75 + 25 . 27 - 150
= 27 . (75 + 25) - 150
= 27 . 100 - 150
= 2700 - 150
= 2550
35 + 34 . 78 + 1 . 78
= 35 + (34 + 1) . 78
= 35 + 35 . 78
= 35 + 2730
= 2765
meo con dang yeu mong cac ban yeu em
k nha
27.25+25.27-150
=27. (25+75)-150
=27.100 -150
=2700-150
=2550
35+34.78+1.78
=35 +78. (34+1)
=35 +78 .35
=35.1+ 78.35
=35.(78+1)
=35.79
=2765
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(100+23+x=469\) \(567-x=278-35\) \(x-120=403+60\)
\(123+x=469\) \(567-x=243\) \(x-120=463\)
\(x=469-123\) \(x=567-243\) \(x=463+120\)
\(x=346\) \(x=324\) \(x=583\)
Vậy x = 346 Vậy x = 324 Vậy : x = 583
a) 100+23+x=469
\(\Leftrightarrow123+x=469\)
\(\Leftrightarrow x=469-123\)
\(\Leftrightarrow x=346\)
b) 567-x = 278-35
\(\Leftrightarrow567-x=243\)
\(\Leftrightarrow x=567-243\)
\(\Leftrightarrow x=324\)
![](https://rs.olm.vn/images/avt/0.png?1311)
TL :
\(150-x+35=100\)
\(x=150-100+35\)
\(x=15\)
x=85
HT
NGHĨA