499 x 338 + 449 x 661 + 999 x 448
(728+277) x 2011 - (456+544) x 1010 - 389 -611
tính nhanh giúp nhé
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b,(723+277).2001-(456+544).1010-389-611
=1000.2001-1000.1010-(389+611)
=1000.2001-1000.1010-1000
=1000.(2001-1010-1)
=1000.990
=990000
a, 92.53+12.92-81+36.92
=92.(53+12+36)-81
=81.101-81
=8181-81
=8100
Ta có :
456x36+456x61+4 x456+456
=456x(36+61+4+456)
=456x...tự tính
=...tự tính
Umm mình tưởng là cái 456 đó tính là 1 thôi chứ nhỉ ban???
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
(544x6-272x2x6)x(544x6+276)
=(544x6-544x6)x(544x6+276)
=0x(544x6+276)=0
\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+....+\frac{2}{x\left(x+1\right)}=\frac{499}{999}\)
\(\Leftrightarrow\frac{2}{6}+\frac{2}{12}+\frac{2}{20}+....+\frac{2}{x\left(x+1\right)}=\frac{499}{999}\)
\(\Leftrightarrow\frac{2}{2.3}+\frac{2}{3.4}+\frac{2}{4.5}+....+\frac{2}{x\left(x+1\right)}=\frac{499}{999}\)
\(\Leftrightarrow2\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+....+\frac{1}{x}-\frac{1}{x+1}\right)=\frac{499}{999}\)
\(\Leftrightarrow\frac{1}{2}-\frac{1}{x+1}=\frac{499}{999}\div2\)
\(\Leftrightarrow\frac{1}{x+1}=\frac{1}{2}-\frac{499}{1998}\)
\(\Leftrightarrow\frac{1}{x+1}=\frac{250}{999}\)
\(\Leftrightarrow\left(x+1\right).250=999\Rightarrow x+1=\frac{999}{250}\Rightarrow x=\frac{999}{250}-1=\frac{749}{250}\)
Như kiểu đề sai hay sao ý
Ta có: X x 456 + X x 544 + X = 12000
X x ( 456 + 544 + 1) = 12000
X x 1001 = 12000
X = 12000/1001
\(X\cdot456+X\cdot544+X=12000\)
\(X\cdot\left(456+544+1\right)=12000\)
\(X\cdot1001=12000\)
\(X=\frac{12000}{1001}\)
\(X=11\frac{989}{1001}\)
\(\cdot\)\(Là\)x (nhân) nha
Ta có:
\(\frac{x+4}{2008}+1+\frac{x+3}{2009}+1=\frac{x+2}{2010}+1+\frac{x+1}{2011}+1\)
\(\frac{x+2012}{2008}+\frac{x+2012}{2009}=\frac{x+2012}{2010}+\frac{x+2012}{2011}\)
\(\left(x+2012\right)\left(\frac{1}{2008}+\frac{1}{2009}-\frac{1}{2010}-\frac{1}{2011}\right)=0\)
\(x=-2012\)
499 x 338 + 449 x 661 + 999 x 448
= 168662 + 329839 + 447552
= 498501 + 447552 = 946053
(728+277) x 2011 - (456+544) x 1010 - 389 -611
= 1005 x 2011 - 1000 x 1010 - 389 - 611
= 2021055 - 1010000 - 389 - 611
= 2021055 - ( 1010000 + 389 + 611 )
= 2021055 - 1011000
= 1010055
đúng thì like cho vs nha thanks nhìu