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(8,5 - 4,3) x 7,4
= 4,2 x 7,4
= 31,08
(8,5 - 4,3) x7,4
= 8,5 x 7,4 - 4,3 x 7,4
= 62,9 - 31,82
= 31,08
(6,75 + 3,25) x 4,2
= 10 x 4,2
= 42
(6,75 + 3,25) x 4,2
= 6,75 x 4,2 + 3,25 x 4,2
= 28,35 + 13,65
= 42
tra loi nhanh cho minh nha oi tra loi truoc va dung minh cho 1 k
a)4,75x3,9+4,75x2,7+4,75x3,4=4,75x(3,9+2,7+3,4)=4,75x10=47,5
a) 4,75 x 3,9 + 4,75 x 2,7 + 4,75 x 3,4
= 4,75 x ( 3,9 + 2,7 + 3,4 )
= 4,75 x 10
= 47,5
b)10,05 x 15,7 – 10,05 x 4,7 – 10,05
= 10,05 x 15,7 – 10,05 x 4,7 – 10,05 x 1
= 10,05 x ( 15,7 - 4,7 - 1 )
= 10,05 x 100,5
c) 8,23 + 9,38+ 10,53 +11,68 +12,83 +13,98
= ( 8,23+13,98 ) + ( 9,38+12,83 ) + ( 10,53+11,68 )
= 22,21 + 22,21 + 22,21
= 66,63
\((2,5\cdot x+2017)\cdot2018=(7,5+2017)\cdot2018\)
\(\Rightarrow(2,5\cdot x+2017)\cdot2018=4085441\)
\(\Rightarrow2,5\cdot x+2017=2024,5\)
\(\Rightarrow2,5x=7,5\)
\(\Rightarrow x=7,5:2,5=3\)
\(3\frac{1}{5}+\frac{2}{5}\left[x+\frac{1}{3}\right]=\frac{21}{5}\)
\(\Rightarrow\frac{16}{5}+\frac{2}{5}\left[x+\frac{1}{3}\right]=\frac{21}{5}\)
\(\Rightarrow\frac{2}{5}\left[x+\frac{1}{3}\right]=\frac{21}{5}-\frac{16}{5}\)
\(\Rightarrow\frac{2}{5}\left[x+\frac{1}{3}\right]=1\)
\(\Rightarrow x+\frac{1}{3}=\frac{5}{2}\)
\(\Rightarrow x=\frac{13}{6}\)
a. x x 1,6 + x x 0,4 = 7
=> x x ( 1,6 + 0,4 ) = 7
=> x x 2 = 7
=> x = 3,5
b.x x 5,2 - x 1,2 =3
=> x x ( 5,2 - 1,2 ) = 3
=> x x 4 = 3
=> x = 0,75
c.x x 14 + 7/100 = 1141 , 07
=> x x 14 + 0,07 = 1141,07
=> x x 14 = 1141
=> x = 285,25
19491247 x (10,7 - 90,95 : 8,5) |
=19491247 x (10,7 - 10,7)
=19491247 x 0
\(\frac{2x-4,36}{0,125}=0,25.42,9-11,7.0,25+0,25.0,8\)
\(\Leftrightarrow\frac{2x-4,36}{0,125}=0,25.\left(42,9-11.7+0,8\right)\)
\(\Leftrightarrow\frac{2x-4,36}{0,125}=0,25.32\)
\(\Leftrightarrow\frac{2x-4,36}{0,125}=8\)
\(\Leftrightarrow2x-4,36=1\)
\(\Leftrightarrow2x=5,36\)
\(\Leftrightarrow x=2,68\)
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, y x 6 = 6,36
y = 6,36 : 6 = 1,06
b, 4,7 - x = 2,1
x = 4,7 - 2,1 = 2,6
k mk nha
a, y x 6 = 6,36 b, 4,7 - x = 2,1
y = 6,36 : 6 x = 4,7 - 2,1
y = 1,06 x = 2,6
a, 5 x ( 4 + 6 x X ) = 290
4 + 6 x X = 290 : 5
4 + 6 x X = 58
6 x X = 58 - 4
6 x X = 54
X = 54 : 6
X = 9
b, ( 15 x 24 - X ) : 0,25 = 100 : \(\frac{1}{4}\)
( 15 x 24 - X ) : 0,25 = 400
15 x 24 - X = 400 x 0,25
15 x 24 - X = 100
360 - X = 100
X = 360 - 100
X = 260
c) X x 4,8 + 5,2 x X = 160
X x ( 4,8 + 5,2 ) = 160
X x 10 = 160
X = 160 : 10
X = 16
d) \(\frac{17}{5}:x=\frac{34}{5}:\frac{4}{3}\)
\(\frac{17}{5}:x=\frac{51}{10}\)
\(x=\frac{17}{5}:\frac{51}{10}\)
\(x=\frac{2}{3}\)
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Học tốt #
4,7 - X = 10,92 : 5,2
4,7-x=2,1
x=4,7-2,1
x= 2,6
Vậy x=2,6
X : 4 = 8,5
x=8,5x4
x=34
Vậy x=34
a)4,7 - X = 10,92 : 5,2
4,7-x=2,1
x=4,7-2,1
x= 2,6
b)X : 4 = 8,5
x=8,5x4
x=34