2006*125+1000
126*2005-880
Tính nhanh:
2006 x 125 + 1000 126 x 2006 - 1006
2006 x 125 + 1000 126 x 2006 − 1006 = 2006 x 125 + 1000 125 x 2006 − 2006 − 1006 = 2006 x 125 + 1000 125 x 2006 + 1000 = 1
Tính nhanh:
2006 x 125 + 1000 126 x 2006 - 1006
TÍNH NHANH
2006 X 125 + 1000/ 2005 X 126 - 880=???
\(\frac{\text{2006 x 125 + 1000}}{\text{ 2005 x 126 - 880}}=???\)
Trả lời :
\(\frac{\text{2006 x 125 + 1000}}{\text{2005 x 126 - 880}}=\frac{\text{251750}}{\text{251750}}=1\)
Chúc bạn học tốt !
a) A=(32,5 + 28,3 . 2,7 - 108,91) . 2006
b)B=2006 . 125 + 1000 / 126 . 2005 - 880
a, ( 32,5 + 28,3 X 2,7 - 108,91 ) X 2006
= (32,5 + 76,41 - 108,91)X 2006
= (108,91 - 108,91) X 2006
= 0 X 2006
= 0
b, \(\frac{2006.125+1000}{126.2005-880}=\frac{2005.125+125+1000}{125.2005+2005-880}=\frac{2005.125+1125}{125.2005+1125}=1\)
Tính nhanh:
B= 2006 * 125 =1000 / 126 * 2005 -880
Các bạn giúp mình với nha
\(B=\frac{2006\cdot125+1000}{126\cdot2005-880}\)
= \(\frac{2005\cdot125+125+1000}{2005\cdot126-880}=\frac{2005\cdot125+1125}{2005\cdot126-880}\)
=\(\frac{2005\cdot125+1125}{2005\cdot125+125-880}=1,007523912\)
tính bằng cách hợp lí:
a)5/3*4/7*3/5*7/8
b)2006*125+1000/126* 2005- 880
a, 5/3*4/7*3/5*7/8
= (5/3*3/5)*(4/7*7/8)
= 1*1/2
=1/2
b, 2006*125+1000/126*2005-880
= (2005+1)*125+1000/126*2005-880
=2005*125+125+1000/126*2005-880
=2005*(125+1000/126)-880+125
=2005*8375/63-880+125
=266537,6984-880+125
=265657,6984+125
=265782,6984
(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
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
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