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\(1-\left(\frac{12}{5}+y=\frac{8}{9}\right):\frac{16}{9}=0\)
\(1-\left(\frac{12}{5}+y-\frac{8}{9}\right)=0\times\frac{16}{9}\)
\(1-\left(\frac{12}{5}+y-\frac{8}{9}\right)=0\)
\(\frac{12}{5}+y-\frac{8}{9}=1-0\)
\(\frac{12}{5}-y+\frac{8}{9}=1\)
\(\frac{12}{5}-y=1-\frac{8}{9}\)
\(\frac{12}{5}-y=\frac{1}{9}\)
\(y=\frac{12}{5}-\frac{1}{9}\)
\(y=\frac{108}{45}-\frac{5}{45}\)
\(y=\frac{103}{45}\)
a) $\frac{{14}}{{18}}:\frac{8}{9} = \frac{7}{9}:\frac{8}{9} = \frac{7}{9} \times \frac{9}{8} = \frac{{63}}{{72}} = \frac{7}{8}$
b) $\frac{9}{6}:\frac{3}{{10}} = \frac{3}{2}:\frac{3}{{10}} = \frac{3}{2} \times \frac{{10}}{3} = \frac{{30}}{6} = 5$
c) $\frac{4}{5}:\frac{{10}}{{15}} = \frac{4}{5}:\frac{2}{3} = \frac{4}{5} \times \frac{3}{2} = \frac{{12}}{{10}} = \frac{6}{5}$
d) $\frac{1}{6}:\frac{{21}}{9} = \frac{1}{6}:\frac{7}{3} = \frac{1}{6} \times \frac{3}{7} = \frac{3}{{42}} = \frac{1}{{14}}$
\(\frac{3}{2}\times\frac{4}{5}\times\frac{2}{6}\times\frac{15}{4}\)
\(=\frac{6}{5}\times\frac{2}{6}\times\frac{15}{4}\)
\(=\frac{2}{5}\times\frac{15}{4}\)
\(=\frac{3}{2}\)
M = (345 x (6789 + 3456 - 245)/690) x 99/100 x 98/99 x...x 2/3 x 1/2
M = ((345 x 10000)/690) x 99/2 (rút gọn)
M = (10000/2) x 99/2
M = 5000 x 99/2
M = 247500
Ok nha
\(\frac{1}{10}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\cdot\frac{5}{6}\cdot\frac{6}{5}\cdot\frac{5}{4}\cdot\frac{4}{3}\cdot\frac{3}{2}=\frac{1}{10}\)
\(\frac{1}{10}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times\frac{5}{6}\times\frac{6}{5}\times\frac{5}{4}\times\frac{4}{3}\times\frac{3}{2}\)\(\frac{3}{2}\)
\(=\frac{1}{10}\times\left(\frac{2}{3}\times\frac{3}{2}\right)\times\left(\frac{3}{4}\times\frac{4}{3}\right)\times\left(\frac{4}{5}\times\frac{5}{4}\right)\times\left(\frac{5}{6}\times\frac{6}{5}\right)\)
\(=\frac{1}{10}\times1\times1\times1\times1\)
\(=\frac{1}{10}\)
#Chúc bạn học tốt !
#k cho mình nhé ?
\(\frac{1}{2}+\frac{2}{3}+\frac{3}{5}=\frac{3}{6}+\frac{4}{6}+\frac{3}{5}\)
=\(\frac{7}{6}+\frac{3}{5}\)
\(=\frac{35}{30}+\frac{18}{30}=\frac{53}{30}\)
\(\frac{3}{8}+\frac{3}{4}+\frac{1}{16}=\frac{6}{16}+\frac{12}{16}+\frac{1}{16}\)
=\(\frac{18}{16}+\frac{1}{16}\)
\(=\frac{19}{16}\)
\(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{12}{15}+\frac{22}{33}+\frac{48}{64}\)
\(=\frac{11}{33}+\frac{16}{64}+\frac{3}{15}+\frac{12}{15}+\frac{22}{33}+\frac{48}{64}\)
\(=\left(\frac{11}{33}+\frac{22}{33}\right)+\left(\frac{16}{64}+\frac{48}{64}\right)+\left(\frac{3}{15}+\frac{12}{15}\right)\)
\(\frac{33}{33}+\frac{64}{64}+\frac{15}{15}\)
\(=1+1+1\)
\(=3\)
1)
a) 80/95 = 16/19
144/153 = 16/17
Do 19 > 17 nên 16/19 < 16/17
⇒ 80/95 < 144/153
b) 474747/919191 = 47/91
Do 47 > 46 nên 47/91 > 46/91
⇒ 474747/919191 > 46/91
c) 21/4 = 5 + 1/4
36/7 = 5 + 1/7
Do 4 < 7 nên 1/4 > 1/7
⇒ 5 + 1/4 > 5 + 1/7
⇒ 21/4 > 36/7
d) 2021/2024 = 1265/2024 + 756/2024
= 5/8 + 189/506
⇒ 2021/2024 > 5/8
2) Tổng ba số là:
58 + 71 + 64 = 193
Số thứ nhất là:
193 - 64 × 2 = 65
Số thứ hai là:
193 - 71 × 2 = 51
Số thứ ba là:
193 - 58 × 2 = 77
`12/4 -1/5 : 2/4`
`=12/4 -1/5 xx 2`
`=12/4 -2/5`
`= 13/5`
224/40