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7/3/8 - 4/5/8 = 59/8 - 37/8 = 12
2/1/4 +5/1/4 = 9/4 + 21/4 = 15/2
3/1/4 x 2/3/5 = 13/4 x 13/5 =11/20
\(7\frac{3}{8}-4\frac{5}{8}=\frac{59}{8}-\frac{37}{8}=\frac{22}{8}\)\(=\)\(2,75\)
\(2\frac{1}{4}+5\frac{1}{4}=\frac{9}{4}+\frac{21}{4}=\frac{30}{4}=7,5\)
\(3\frac{1}{4}\times2\frac{3}{5}=\frac{13}{4}\times\frac{13}{5}=\frac{169}{20}=8,45\)
#Minyun
a)\(\left(x+3\right)\times5+1=20\Leftrightarrow5x+15=19\)
\(\Leftrightarrow5x=4\Leftrightarrow x=\frac{4}{5}\)
b)sai đề
c)\(2\frac{3}{7}\times x+1\frac{5}{4}=5\frac{3}{42}\)\(\Leftrightarrow\frac{17}{7}\times x+\frac{9}{4}=\frac{71}{14}\) \(\Leftrightarrow\frac{17}{7}\times x+\frac{63}{28}=\frac{142}{28}\)
\(\Leftrightarrow\frac{17}{7}\times x=\frac{79}{28}\Leftrightarrow x=\frac{17}{7}:\frac{79}{28}\) \(\Leftrightarrow x=\frac{17}{7}\times\frac{28}{79}\Leftrightarrow x=\frac{476}{553}=\frac{68}{79}\)
d)\(10\frac{2}{3}-x:\frac{6}{7}=8\frac{1}{3}-6\frac{2}{7}\Leftrightarrow\frac{32}{3}-x:\frac{6}{7}=\frac{25}{3}-\frac{44}{7}\) \(\Leftrightarrow\frac{224}{21}-x:\frac{6}{7}=\frac{75}{21}-\frac{132}{21}\Leftrightarrow-\frac{57}{21}-\frac{224}{21}\)
\(\Leftrightarrow-x:\frac{6}{7}=-\frac{281}{21}\Leftrightarrow-x=-\frac{281}{21}\times\frac{6}{7}\) \(\Leftrightarrow-x=-\frac{1686}{147}\Leftrightarrow x=\frac{562}{49}=11\frac{23}{49}\)
\(y-3\frac{3}{4}=1\frac{1}{6}\)
=> \(y-\frac{15}{4}=\frac{7}{6}\)
=> \(y=\frac{7}{6}+\frac{15}{4}\)
=> \(y=\frac{14}{12}+\frac{45}{12}\)
=> \(y=\frac{59}{12}\)
a) = 17/19 - 17/19 + 27/35 + 35/35 = 0 + 62/35
b) = 1/3 x 4/5 + 1/3 x6/5 + 1/3 x 2 = 1/3(4/5 + 6/5 + 2) = 1/3 x 4 = = 4/3
c) 4/7 x 2/9 + 4/7 x 7/9 + 2/3 = 4/7 x (2/9 + 7/9) + 2/3 = 4/7 x 1 + 2/3 = 26/21
A) 17/19 - 17/19 + 27/35 + 35/35 = 0 + 62/35
B) 1/3 x 4/5 + 1/3 x 6/5 + 1/3 x 2 = 1/3 x(4/5 + 6/5 x 2 ) = 1/3 x 4 = 4/3
c) TƯƠNG TỰ CÂU A VÀ B
* HOKTOT*
NHA
2/5 = 0,4
3/5 = 0,6
3/4 = 0,75
5/8 = 0,625
2 1/2 = 2,5
1/4 = 0,25
4 1/5 = 4,2
5 3/8 = 5,375
Học tốt!!!
a.7,2 :2 x 58,6 + 2,93 x 2 x 64
= 3,6 x 58,6 + 5,86 x 64
=210,96 + 357,04
=586
b.\(4\frac{2}{5}+2\frac{3}{7}-2\frac{2}{5}+5\frac{4}{7}\)
=\(\left(4\frac{2}{5}-2\frac{2}{5}\right)+\left(2\frac{3}{7}+5\frac{4}{7}\right)\)
= 2 + 8
= 10
c. 2 x 41 x 36 + 8 x 9 x 58 + 12 x 6
=72 x 41 + 72 x 58 + 72 x 1
=72 x ( 41 + 58 +1 )
=72 x 100
=7200
d, \(\frac{3}{5}\)x \(\frac{1}{2}\):\(\frac{2}{5}\)
=\(\frac{3}{5}\)x \(\frac{1}{2}\)x\(\frac{5}{2}\)
=\(\frac{3}{4}\)
\(\frac{2}{5}\cdot\frac{1}{2}-\frac{2}{5}\cdot\frac{1}{3}-\frac{2}{5}\cdot\frac{1}{6}\)
\(=\frac{2}{5}\cdot\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
\(=\frac{2}{5}\cdot0=0\)
\(\frac{19}{11}+\left(\frac{8}{13}+\frac{3}{11}\right)\)
\(=\frac{19+3}{11}+\frac{8}{13}\)
\(=2+\frac{8}{13}=\frac{34}{13}\)
\(1,5+2\frac{3}{5}+\frac{4}{7}\)
\(=\frac{3}{2}+\frac{13}{5}+\frac{4}{7}\)
\(=\frac{327}{70}\)
\(x-\frac{5}{4}=6\cdot\frac{5}{8}\)
\(x-\frac{5}{4}=\frac{15}{4}\)
\(x=\frac{15}{4}+\frac{5}{4}\)
\(x=\frac{15+5}{4}=\frac{20}{4}=5\)
\(x\div2\frac{3}{4}=5\frac{2}{3}\)
\(x=5\frac{2}{3}\cdot2\frac{3}{4}\)
\(x=\frac{187}{12}\)
\(\frac{2}{3}\div x=\frac{3}{4}\)
\(x=\frac{2}{3}\div\frac{3}{4}\)
\(x=\frac{8}{9}\)
0, 75 = 3/4
Hiệu số phần bằng nhau là:
4 - 3 = 1
Số bé là:
0, 75 : 1 x 3 = 2, 25
Số lớn là:
2, 25 + 0, 75 = 3
Đ/s: ...
Trung bình cộng của 3 số là:
6045 : 3 = 2015
=> Số thứ 2 là 2015
Số thứ nhất là:
2015 - 1 = 2014
Số thứ 3 là:
2015 + 1 = 2016
Đ/s: ...
\(x+\frac{2}{3}=2\frac{1}{2}\)
\(x+\frac{2}{3}=\frac{5}{2}\)
\(x=\frac{5}{2}-\frac{2}{3}\)
\(x=\frac{11}{6}\)
\(8,75.x+1,25.x=26,3\)
\(x.\left(8,75+1,25\right)=26,3\)
\(x.10=26,3\)
\(x=26,3\div10\)
\(x=2,63\)
\(\left(8\dfrac{2}{5}+5\dfrac{3}{4}\right).\dfrac{1}{2}=\left(\dfrac{42}{5}+\dfrac{23}{4}\right).\dfrac{1}{2}=\left(\dfrac{168}{20}+\dfrac{115}{20}\right).\dfrac{1}{2}=\dfrac{283}{20}.\dfrac{1}{2}=\dfrac{283}{40}\)
(8\(\dfrac{2}{5}\) + 5\(\dfrac{3}{4}\) ) x \(\dfrac{1}{2}\)
=( \(\dfrac{42}{5}\) + \(\dfrac{23}{4}\)) x \(\dfrac{1}{2}\)
= ( \(\dfrac{168}{20}\) + \(\dfrac{115}{20}\)) x \(\dfrac{1}{2}\)
= \(\dfrac{283}{40}\)