Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
( 35 x 18 - 9 x 70 ) x 2010 x 2011 x 2012 x ... x 2020
= 0 x 2010 x 2011 x 2012 x ... x 2020
= 0 nha !
35 x 18 - 9 x 70 + 100
= 35 x 2 x 9 - 9 x 70 + 100
= 70 x 9 - 9 x 70 + 100
= 0 + 100
= 100
a,
104,4 . x -14,1 . x + 9,6 . x =25
x(104,4 - 14,1 + 9,6 ) = 25
x.99,9 = 25
x = \(\frac{250}{999}\)
b)
\(\frac{2009.2010+2000}{2011.2010-2020}=\frac{2009.2010+2000}{\left(2009+2\right).2010-2020}\)
\(=\frac{2009.2010+2000}{2009.2010+2.2010-2020}\)
\(=\frac{2009.2010+2000}{2009.2010+4020-2020}\)
\(=\frac{2009.2010+2000}{2009.2010+2000}\)
\(=1\)
a. 1⋅2⋅3+2⋅4⋅6+3⋅6⋅9+4⋅8⋅12
= 6+2⋅4⋅6+3⋅6⋅9+4⋅8⋅12
= 6+48+3⋅6⋅9+4⋅8⋅12
= 6+48+162+4⋅8⋅12
= 6+48+162+384
= 600
b . Ta có \(A=\frac{2010+2011}{2011+2012}=\frac{2010}{2011+2012}+\frac{2011}{2011+2012}.\)
Ta có : \(\frac{2010}{2011+2012}< \frac{2010}{2011}\) và \(\frac{2011}{2011+2012}< \frac{2011}{2012}\)
=> \(\frac{2010+2011}{2011+2012}< \frac{2010}{2011}+\frac{2011}{2012}\)
=> A < B
2010 x 2010 - 2009 x 2011
= ( 2011 - 2010 ) x 2010 - 2009 x 2011
= 2011 x 2010 - 1 x 2010 - 2009 x 2011
= 2011 x ( 2010 - 2009 ) - 1 x 2010
= 2011 x 1 - 2010
= 2011 - 2010
= 1
( 456 x 11 + 912 ) x 37 : ( 13 x 74 )
= ( 456 x 11 + 456 x 2 ) x 37 : ( 13 x 74 )
= [ 456 x ( 11 + 2 ) ] x 37 : ( 13 x 74 )
= [ 456 x 13 ] x 37 : ( 13 x 74 )
= 13 x 456 x 37 : ( 13 x 37 x 2 )
= 13 x 37 x 2 x 228 : ( 13 x 37 x 2 )
= ( 13 x 37 x 2 ) x 228 : ( 13 x 37 x 2 )
= ( 13 x 37 x 2 ) : ( 13 x 37 x 2 ) x 228
= 1 x 228
= 228
(44 x 52 x 60) : (11 x13 x 15 )
= [ ( 4 x 11 ) x ( 4 x 13 ) x ( 4 x 15 ) ] : (11 x13 x 15 )
= [ 4 x 11 x 4 x 13 x 4 x 15 ] : (11 x13 x 15 )
= [ ( 4 x 4 x 4 ) x ( 11 x 13 x 15 ) ] : (11 x13 x 15 )
= 64 x (11 x13 x 15 ) : (11 x13 x 15 )
= 64 x 1
= 64
a) 2010 x 2010 - 2009 x 2011
= 2010 x 2010 - [ 2009 x ( 2010 +1) ]
=2010 x 2010 - 2009 x 2010 - 2009
=2010( 2010 - 2009 ) -2009
= 2010 -2019
= 1
c) ( 44 x 52 x60 ) : (11x13x15)
\(\frac{44\cdot52\cdot60}{11\cdot13\cdot15}=\frac{4\cdot11\cdot4\cdot13\cdot4\cdot15}{11\cdot13\cdot15}=64\)
B) (456 x 11 +912) x 37 : ( 13 x 74 )
= \(\frac{\left(456\cdot11+912\right)\cdot37}{13\cdot74}=\frac{\left[456\left(11+2\right)\right]\cdot37}{13\cdot37}=\frac{456\cdot13}{13\cdot2}=\frac{456}{2}=228\)
Nhớ k mik nha bn
\(\left(1-\dfrac{1}{35}\right)\times\left(1-\dfrac{1}{36}\right)\times..\times\left(1-\dfrac{1}{2011}\right)\)
=\(\dfrac{34}{35}\times\dfrac{35}{36}\times\dfrac{36}{37}\times...\times\dfrac{2010}{2011}\)
=\(\dfrac{34}{2011}\)
Kết quả là:0
( 35 x 18 - 9 x 70 ) x 2010 x 2011 x ... x 2020
= (35 x 18 - 9 x 35 x 2) x 2010 x 2011 x ... x 2020
= ( 35 x 18 - 18 x 35 ) x 2010 x 2011 x ... x 2020
= 35 x (18 - 18 ) x 2010 x 2011 x ... x 2020
= 35 x 0 x 2010 x 2011 x ... x 2020
= 0 x 2010 x 2011 x ... x 2020
= 0