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Làm là:
(97,6x37+726,9x37)=37x(97,6+726,9)=37x824,5=30506,5.
(96x2-960x0,1+96000x0,001-9,6)=9,6x10x2-9,6x100x0,1+9,6x10000x0,001-9,6=96x20-9,6x10+9,6x10-9,6x1=9,6x(20-10+10-1)=9,6x19=182,4
=30506,5x182,4
=5564385,6
= 96 x 87 + 66 / 96 x 87 + 96 - 30
= 96 x 87 + 66 / 96 x 87 + 66
= 1
Tk mk nha
96*87+66/96*88-36
= 96 * 87 + 66 / 96 * 87 + 96 - 36
= 96 * 87 + 66 / 96 * 87 + ( 96 - 36 )
= 96 * 87 + 66 / 96 * 87 + 66
= 1
\(\frac{9,6\div0,2\times15,4\times2\times15,4\div0,25}{30,8\div0,5\times7,7\div0,125\times5\times1,6}\)
\(=\frac{9,6\times5\times15,4\times2\times15,4\times4}{30,8\times2\times7,7\times8\times5\times1,6}=\frac{\left(1,6\times6\right)\times\left(5\times2\right)\times\left(7,7\times2\right)\times15,4\times4}{\left(15,4\times2\right)\times\left(2\times5\right)\times7,7\times\left(4\times2\right)\times1,6}=\frac{6}{2}=3\)
P/s: Hoq chắc :<
=28,8x(71,2+28,2)x134x(1,1-0,1-1)
= ...........................x134x0
=..............x0
=0
[ 71,2 x 28,8 + 28,8 x 28,2] x [ 134 x 1,1 - 134 x 0,1 - 134 ]
= [ 71,2 x 28,8 + 28,8 x 28,2] x 134x ( 1,1 - 0,1 - 1 )
= [ 71,2 x 28,8 + 28,8 x 28,2] x 134 x 0
= 0
= [ 28,8 x ( 71,2 + 28,2 ) ] x [ 134 x ( 1,1 - 0,1 -1 )
= [ 28,8 x 99,4 ] x [ 134 x 0 ]
= 2862,72 x 0
= 0
Tiện thể kb vs mình luôn nhé!
\(\frac{2x-4,36}{0,125}=0,25.42,9-11,7.0,25+0,25.0,8\)
\(\Leftrightarrow\frac{2x-4,36}{0,125}=0,25.\left(42,9-11.7+0,8\right)\)
\(\Leftrightarrow\frac{2x-4,36}{0,125}=0,25.32\)
\(\Leftrightarrow\frac{2x-4,36}{0,125}=8\)
\(\Leftrightarrow2x-4,36=1\)
\(\Leftrightarrow2x=5,36\)
\(\Leftrightarrow x=2,68\)
b) \(N=\frac{1}{1.5}+\frac{1}{5.10}+\frac{1}{10.15}+\frac{1}{15.20}+...+\frac{1}{2005.2010}\)
\(\Leftrightarrow N=\frac{1}{5}\left(1-\frac{1}{5}+\frac{1}{5}-\frac{1}{10}+\frac{1}{10}-\frac{1}{15}+\frac{1}{15}-\frac{1}{20}+...+\frac{1}{2005}-\frac{1}{2010}\right)\)
\(\Leftrightarrow N=\frac{1}{5}\left(1-\frac{1}{2010}\right)\)
\(\Leftrightarrow N=\frac{1}{5}.\frac{2009}{2010}=\frac{2009}{10050}\)
Bài 1:
a)\(\frac{2\cdot x-4,36}{0,125}=0,25\cdot42,9-11,7\cdot0,25+0,25\cdot0,8\)
\(\frac{2\cdot x-4,36}{0,125}=0,25\cdot\left(42,9-11,7+0,8\right)\)
\(\frac{2\cdot x-4,36}{0,125}=0,25\cdot32\)
\(\frac{2\cdot x-4,36}{0,125}=8\)
\(2\cdot x-4,36=8\cdot0,125\)
\(2\cdot x-4,36=1\)
\(2\cdot x=1+4,36\)
\(2\cdot x=5,36\)
\(x=\frac{5,36}{2}=2,68\)
b) \(N=\frac{1}{1\cdot5}+\frac{1}{5\cdot10}+\frac{1}{10\cdot15}+\frac{1}{15\cdot20}+...+\frac{1}{2005\cdot2010}\)
\(4N=\frac{4}{1\cdot5}+\frac{4}{5\cdot10}+\frac{4}{10\cdot15}+\frac{4}{15\cdot20}+...+\frac{4}{2005\cdot2010}\)
\(4N=1-\frac{1}{5}+\frac{1}{5}-\frac{1}{10}+\frac{1}{10}-\frac{1}{15}+\frac{1}{15}-\frac{1}{20}+...+\frac{1}{2005}-\frac{1}{2010}\)
\(4N=1-\frac{1}{2010}=\frac{2009}{2010}\)
\(N=\frac{2009}{2010}\div4=\frac{2009}{8040}\)
Bài 2:
a) ( x + 5,2 ) : 3,2 = 4,7 ( dư 0,5 )
\(x+5,2=4,7\cdot3,2+0,5\)
\(x+5,2=15,54\)
\(x=15,54-5,2=10,34\)
b)\(A=\frac{4047991-2010\cdot2009}{4050000-2011\cdot2009}\)
\(A=\frac{4047991-2010\cdot2009}{4050000-2009-2010\cdot2009}\)
\(A=\frac{4047991-2010\cdot2009}{4047991-2010\cdot2009}=1\)
Bài 3:
a) \(104,5\cdot x-14,1\cdot x+9,6\cdot x=25\)
\(x\cdot\left(104,5-14,1+9,6\right)=25\)
\(x\cdot100=25\)
\(x=\frac{25}{100}=\frac{1}{4}=0,25\)
b) \(T=\frac{2009\cdot2010+2000}{2011\cdot2010-2020}\)
\(T=\frac{2009\cdot2010+2000}{2009\cdot2010+4020-2020}\)
\(T=\frac{2009\cdot2010+2000}{2009\cdot2010+2000}=1\)
A=98-97+96-95+......+2-1
A= (98-97)+(96-95)+.....+(2-1)
A= 1+1+..............+1
A= 98
= (97,6*37 +726,9*37)*(9682-96+96-96-96)
=(97,6*37+726,9*37)*0
=0
={ 37x (97,6+ 726,9)} x { 96 x 2 - 96 + 96 - 96 - 9,6 }
=30506,5 x 86,4
=2635761,6
hình như sai rồi
9,6 x 87 + 96 + 28,8
= 96 x 8,7 + 96 x 1 + 96 x 0,3
= 96 x ( 8,7 + 1 + 0,3)
= 96 x 10
= 960
9,6 x 87 + 96 + 28,8
= 835,2 + 96 + 28,8
= (835,2 + 28,8) + 96
= 864 + 96
= 960