Tìm x:
[(x + 50 ) . 50 - 50] : 50 = 50
480 + 45.4 = (x + 125) : 5 + 260
Tính một cách hợp lí :
(195 - 13.15) : (1945 + 1014) =
(195-13.15):(1945+1014)
(x-2005).2006=0
480+45.4=(x+125):5+260
2005.(x-2006)=2005
[(x+50).50-50]:50=50
nhầm
câu c :
=> 480 + 180 = (x + 125) : 5 + 260
=> 660 = (x + 125) : 5 + 260
=> (x + 125) : 5 = 400
=> x + 125 = 2000
=> x = 1875
câu e :
=> (x + 50) . 50 - 50 = 2500
=> (x + 50) . 50 = 2550
=> x + 50 = 51
=> x = 1
a/ = (195 - 195) : (1945 + 1014) = 0 : (1945 + 1014) = 0
b/ => x - 2005 = 0 => x = 0 + 2005 = 2005
c/ => 480 + 180 = (x + 125) : 5 + 260
=> 300 = (x + 125) : 5 + 260
=> (x + 125) : 5 = 40
=> x + 125 = 8
=> x = -117
d/ => x - 2006 = 1 => x = 2007
e/ => (x + 50) . 50 - 50 = 1
=> (x + 50) . 50 = 51
=> x + 50 = 51/50
=> x = -2449/50
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
[(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
Tính giá trị của biểu thức
5500-375+1182
8376-2453-699
1054+987-1108
1540:11+1890:9+982
Tính
7080-(1000-536)
2806-(1134+950)-280
1953+(17432-56.223):16
5347+(2376-734)
136.(668-558)-404.25
6010-(130.52-68890:83)
Tính 1 cách họp lí
1234.2014+2014.8766
1357.2468-2468.357
(14678:2+2476).(2576-2575)
(195-13.15):(1945+1014)
Tìm x
456+(x-357)=1362
(x-2005).2006=0
2005.(x-2006)=2005
(2345-x)-183=2014
480+45.4=(x+125):5+260
[(x+50).50-50]:50=50
5500 - 375 + 1182 = 6307
8376 - 2453 - 699 = 5224
1054 + 987 - 1108 = 933
1540: 11 + 1890: 9 + 982 = 140 + 210 + 982 = 1332
7080-(1000-536) = 6616
2806-(1134+950)-280 = 2806 - 2084 - 280 = 442
1953 + (17432-56.223):16 = 1953 + 4944:16 = 2262
5347 +(2376-734) = 6989
136.(668-558)-404.25 = 14960 - 10100 = 4860
6010-(130.52-68890:83) = 6010 - (6760 - 830) = 80
Bài hơi dài nên nếu mình có làm sai thì bạn thông cảm nha
Tính hợp lí:
1234.2014 + 2014.8766 = 2014.(1234+8766) = 2014.10000 = 20140000
1357.2468-2468.357 = 2468.(1357 - 357) = 2468.1000 = 2468000
(14678:2+2476).(2576-2575) = (7339+2476).1 = 9815
(195-13.15):(1945+1014) = 0:(1945+1014) = 0
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;
a (x-2005). 2006=0
b 2005.(x-2006)=2005
c 480+45.4=(x+125):5+260
d [(x+50).50-50]:50=50
a) (x - 2005 ) . 2006 = 0
x - 2005 = 0 : 2006
x - 2005 = 0
x = 0 + 2005
x = 2005
b) 2005.(x-2006) = 2005
x - 2006 = 2005 : 2005
x - 2006 = 1
x = 1 + 2006
x = 2007
c) 480+45.4=(x+125) : 5 + 260
480 + 180 = (x+125) : 5 + 260
660 = ( x + 125 ) : 5 + 260
660 - 260 = ( x+ 125 ) : 5
400 = ( x + 125 ) : 5
400 x 5 = x + 125
2000 = x + 125
2000 - 125 = x
1875 = x
tương tự
Tính một cách hợp lí:(làm cả cách tính)
A. (14678 : 2 + 2476) x (2576 - 2575)
B. (195 - 13 x 5) : (1945 + 1014)