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1) 50x50=2500
( x+50).50=2500+50=2550
x+50 =2550:50=51
x =51-50=1
![](https://rs.olm.vn/images/avt/0.png?1311)
480+45.4=(x+125):5+260
660=(x+125):5+260
400=(x+125):5
x+125=2000
x=1875
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1. a. 1234.2014+2014.8766
= 2014.(1234+8766)
= 2014.10000
= 20140000
b. 1357.2468-2468.357
= 2468.(1357-357)
= 2468.1000
= 2468000
c. (14678:2+2476).(2576-2575)-> (nếu hợp lí thì chỗ này phải là 2576)
= (7339+2476).1
= 9815.1
= 9815
d. (195-13.15) : (1945+1014)
= (195-195) : (1945+1014)
= 0 : (1945+1014)
= 0
2. a. 456+(x-357)=1362
=> x-357=1362-456
=> x-357=906
=> x=906+357
=> x=1263
b. (2345-x)-183=2014
=> 2345-x=2014+183
=> 2345-x=2197
=> x=2345-2197
=> x=148
c. (x-2005).2006=0
=> x-2005=0:2006
=> x-2005=0
=> x=2005+0
=> x=2005
d. 480+45.4=(x+125):5+260
=> 480+180=(x+125):5+260
=> 660=(x+125):5+260
=> (x+125):5=660-260
=> (x+125):5=400
=> x+125=400.5
=> x+125=2000
=> x=2000-125
=> x=1875
e. 2005.(x-2006)=2005
=> x-2006=2005:2005
=> x-2006=1
=> x=1+2006
=> x=2007
g. [(x+50).50-50]:50=50
=> (x+50).50-50=50.50
=> (x+50).50-50=2500
=> (x+50).50=2500+50
=> (x+50).50=2550
=> x+50=2550:50
=> x+50=51
=> x=51-50
=> x=1
![](https://rs.olm.vn/images/avt/0.png?1311)
[(x+50).50-50]:50=50
(x+50).50-50=50.50
(x+50).50-50=2500
(x+50).50=2500+50
(x+50).50=2550
x+50=2550:50
x+50=51
x=51-50
x=1
![](https://rs.olm.vn/images/avt/0.png?1311)
a)(x-2005).2006=0
=>x-2005=0
=>x=2005
b)480+45.4=(x+125):5+260
=>480+180=(x+125):5+260
=>660=(x+125):5+260
=>(x+125):5=400
=>x+125=2000
=>x=1875
c)2005.(x-2006)=2005
=>x-2006=1
=>x=2007
d){(x+50).50-50}:50=50
=>(x+50).50-50=2500
=>(x+50)*50=2550
=>x+50=51
=>x=1
![](https://rs.olm.vn/images/avt/0.png?1311)
a)480+180=(x+25+260)
660 = x+285
x=375
b) x.(x+1)= (2+2500)*|(2500-2):2+1| = 3127500
còn lại bạn tự làm nhé ( nhớ k cho mình
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mk nhầm đọc ko kĩ đề nhân 4 tưởng nhân 2^^
\(\text{480+45.4=(x+125):5+260 }\\ \left(x+125\right):5+260=660\\ \left(x+125\right):5=660-260=400\\ x+125=400.5=2000\\ x=2000-125=1875\)
\(\text{480+45.4=(x+125):5+260 }\\ \left(x +125\right):5+260=570\\ \left(x+125\right):5=570-260=310\\ \left(x+125\right)=310.5=1550\\ x=1550-125=1425\)
(x-2005).2006 = 0
x-2005 = 0:2006
x-2005 = 0
x = 0+2005
x = 2005
480+45.4 = (x+125):5+260
48+180 = x:5+125:5+260
228 = x:5+285
228-285 = x:5
-57 = x:5
-57.5 = x
-285 = x