Viết thành tỉ số phần trăm:
a) \(\frac{1}{4}=..........\)
b) \(\frac{3}{5}=..........\)
c) \(\frac{5}{8}=..........\)
d) \(\frac{15}{16}=..........\)
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3,
a)
= \(-\frac{5}{21}:\frac{4}{5}+\frac{5}{21}:\frac{4}{5}\)
= \(\left(-\frac{5}{21}+\frac{5}{21}\right):\frac{4}{5}\)
= \(0:\frac{4}{5}=0\)
2,
a) \(\frac{-3}{4}\).\(\frac{12}{-5}\).(\(\frac{-25}{6}\))
= \(\frac{-3.4.3.\left(-5\right).5}{4.\left(-5\right).3.3}\)
= \(-5\)
b) (−2).\(\frac{-38}{21}\).\(\frac{-7}{4}\).(\(\frac{-3}{8}\))
= \(\frac{-2.\left(-38\right)\left(-7\right)\left(-3\right)}{\left(-7\right)\left(-3\right)\left(-2\right)\left(-2\right).8}\)
= \(\frac{19}{8}\)
c) (\(\frac{11}{12}:\frac{33}{16}\)).\(\frac{3}{5}\)
= \(\left(\frac{11}{12}.\frac{16}{33}\right).\frac{3}{5}\)
= \(\frac{4}{9}.\frac{3}{5}\)
= \(\frac{4}{15}\)
d) \(\frac{7}{23}\left[\left(\frac{-8}{6}\right)-\frac{45}{18}\right]\)
= \(\frac{7}{23}.\left(\frac{-41}{10}\right)\)
= \(\frac{-287}{203}\)
3. Tính:
a) (\(\frac{-2}{3}+\frac{3}{7}\)):\(\frac{4}{5}\)+(\(\frac{-1}{3}+\frac{4}{7}\)):\(\frac{4}{5}\)
= (\(\frac{-2}{3}+\frac{3}{7}\)\(+\)\(\frac{-1}{3}+\frac{4}{7}\)) : \(\frac{4}{5}\)
= 0 : \(\frac{4}{5}\)
= 0
b) \(\frac{5}{9}\):(\(\frac{1}{11}-\frac{5}{22}\))+\(\frac{5}{9}\):(\(\frac{1}{15}-\frac{2}{3}\))
= \(\frac{5}{9}\): \(\frac{-3}{22}\)+ \(\frac{5}{9}\): \(\frac{-3}{5}\)
= \(\frac{5}{9}\): \(\frac{-81}{110}\)
= \(\frac{-550}{729}\)
C = \(\dfrac{\dfrac{1}{9}-\dfrac{5}{6}-4}{\dfrac{7}{12}-\dfrac{1}{36}-10}\)
C = \(\dfrac{\dfrac{6-45-216}{54}}{\dfrac{21-1-360}{36}}\)
C = \(\dfrac{\dfrac{-85}{18}}{-\dfrac{85}{9}}\)
C = \(\dfrac{1}{2}\)
2/5= 4/10= 0,4
3/4= 75/100= 0,75
1 3/5= 1 6/10= 1,6
2 1/4= 2 25/100= 2,25
k mk nhóe
\(\frac{2}{5}=0,4\)
\(\frac{3}{4}=0,75\)
\(1\frac{3}{5}=1,6\)
\(2\frac{1}{4}=2,25\)
\(\frac{1}{4}=40\%\)
\(\frac{3}{5}=60\%\)
\(\frac{5}{8}=62,5\%\)
\(\frac{15}{16}=93,75\%\)
Chúc em học tốt!!!
mình không viết phân số được nên bạn thông cảm nha!
a) 1/2 + 2/3 + 3/4 + 4/5 < 44
=> 363/140 < 44
=> 363/140 < 6160/140
=> 363 < 6160
Trả lời :
a) \(\frac{1}{4}=25\%\)
b)\(\frac{3}{5}=60\%\)
c)\(\frac{5}{8}=62,5\%\)
d) \(\frac{15}{16}=93,75\%\)
- Study well -
=25 %
=60%
=62,5%
=93,75%
hok tốt