tìm x :
( x - 2 005 ). 2 006 = 0
d) 480 + 45.4 = ( x + 125 ) : 5 + 260
tìm x
480+45.4=(x+125):5+260
Tìm x
[(x+50).50-50]:50=50
480+45.4=(x+125):5+260
1) 50x50=2500
( x+50).50=2500+50=2550
x+50 =2550:50=51
x =51-50=1
Tim x biết 480+45.4= (x+125):5+260
480 + 180 = ( x + 125 ) : 5 + 260
( x + 125 ) : 5 + 260 = 660
( x + 125 ) : 5 = 660 - 260 = 400
x + 125 = 400 . 5 = 2000
x = 2000 - 125 = 1875
480+180=(x+125):5+260
(x+125):5+260=660
(x+125):5=400
x+125=2000
x=1875
480+45.4={x+125}:5+260
480+45.4=(x+125):5+260
660=(x+125):5+260
400=(x+125):5
x+125=2000
x=1875
Bài 1: Tính một cách hợp lí:
a) 1234.2014 + 2014. 8766
b) 1357. 2468 -2468.357
c) (14678:2 + 2476). (2576-2575)
d) (195-13.15) : (1945 + 1014)
bài 2: Tìm x
a) 456+ (x - 357) = 1362
b) ( 2345 - x) - 183= 2014
c) (x-2 005). 2006=0
d) 480+45.4= (x+125):5+260
e) 2005. (x-2006)= 2005
g) [(x+50).50-50]:50= 50
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
Tìm x:
480=45.4=(x+125):5+260
[(x+50).50-50]:50=50
[(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
Tìm x
(x-2005).2006=0
480+45.4=(x+125):5+260
2005.(x-2006)=2005
{(x+50).50-50}:50=50
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
[( x + 50).50-50]:50 = 50
480 + 45.4 = (x + 125) :5 + 260;
GIÚP MÌNH GIẢI HAI BÀI NÀY NHÉ
a)480+45.4=(x+125:5+260)
b)x.(x+1)=2+4+6+8+10+...+2500
Cảm ƠN
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