2 . ( x + 5 ) + 126 = x + 1000 - 254
2006 x 125 + 1000 / 126 x 2006 - 1006
\(\dfrac{2006.125+1000}{126.2006-1006}\)
\(=\)\(\dfrac{2006.125+1000}{(125+1).2006-1006}\)
\(=\)\(\dfrac{2006.125+1000}{125.2006+1.2006-1006}\)
\(=\)\(\dfrac{2006.125+1000}{125.2006+2006-1006}\)
\(=\)\(\dfrac{2006.125+1000}{125.2006+1000}\)
\(=\) 1
2006 x 125 + 1000/126 x 2006 - 1006
2006 x 125 + 1000/126 x 2006 - 1006
= 2006 . 125 + 1000/125 . 2006 + 1 .2006 - 1006
= 2006 . 125 + 100/125 . 2006 + 1000
= 1
2006 x 125 + 1000/126 x 2006 - 1006
= 2006 x 125 + 1000/125 x 2006 + 1 x 2006 - 1006
= 2006 x 125 + 1000/125 x 2006 + 1000
= 1
2006 x 125 + 1000 / 126 x 2005 - 888
2006.125 + 1000 / 126. 2005 - 880 = ( 2005 + 1 ). 125 + 1000 / (125+1). 2005 - 880 =2005. 125 + 125 + 1000 / 2005. 125 + 2005 -880 =2005. 125 = 1125 / 2005 + 125 + 1125
bài 5; Tìm y
a)\(980+y:94=8245\)
b)\(45\) x y x \(36=3240\)
c) \(3865-y+875=1000\)
d)\(4788:126\) x y \(=1596\)
e) \(24624\) : y : 9\(=76\)
a) \(980+y:94=8245\)
\(y:94=7265\)
\(y=7265\times94\)
\(y=682910\)
b) \(45\times y\times36=3240\)
\(45\times y=3240:36\)
\(45\times y=90\)
\(y=90:45\)
\(y=2\)
c) \(3865-y+875=1000\)
\(3865-y=125\)
\(y=3865-125\)
\(y=3740\)
d) \(4788:126\times y=1596\)
\(126\times y=4788:1596\)
\(126\times y=3\)
\(y=\dfrac{3}{126}\)
\(y=\dfrac{1}{42}\)
e) \(24624:y:9=76\)
\(y:9=24624:76\)
\(y:9=324\)
\(y=324\times9\)
\(y=2916\)
tính nhanh : 2010 x 125 + 1000 / 126 x 2010 - 1010
\(\frac{2010.125+1000}{126.2010-1010}=\frac{10\left(201.125+100\right)}{10\left(201.126-101\right)}=\frac{201.125-101+201}{2011.126-101}\)
\(=\frac{201.126-101}{201.126-101}=1\)
=2010 x 125 + 2010x 126 + 1000+1010
=2010 x 125 + 2010 x 126 + 2010
=2010 x ( 125 + 126 +1 )
=2010 x 252
=506520
\(\frac{2010.125+1000}{126.2010-1010}=\frac{2010.125+1000}{2010.125+2010-1010}=\frac{2010.125+1000}{2010.125+1000}=\frac{1}{1}=1\)
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 !
tìm x là số tự nhiên nhỏ nhất sao cho x xhia cho 1000 dư 532 và chia cho 289 thì dư 254
(2545 + 2546) : (2543 x 2542)
\(\frac{254^5+254^6}{254^3.254^2}=\frac{254^3.254^2+254^6}{254^3.254^2}=254^6\)
\(\frac{254^5+254^6}{254^3\cdot254^2}=\frac{254^5\left(1+254\right)}{254^5}=1+254=255\)
tìm số tự nhiên x biết:
a) 14 chia hết cho( 2x+3)
b)126 chia hết cho x, 252 chia hết cho x, 504 chia hết cho x
c) x chia hết cho 126, x chia hết cho 252, x chia hết cho 504 ( 1000<x<1500)
d) 2x+3 chia hết cho x-2
em gửi bài qua fb thầy chữa cho nhé, tìm fb của thầy bằng sđt: 0975705122 nhé.