1=.../6=.../14= .../... 2=4/...=.../3=12/...
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PT
0
8 tháng 8 2023
a) \(12\dfrac{1}{3}-\left(3\dfrac{3}{4}+4\dfrac{3}{4}\right)=\dfrac{37}{3}-\left(\dfrac{15}{4}+\dfrac{19}{4}\right)\)
\(=\dfrac{37}{3}-\dfrac{34}{4}=\dfrac{37}{3}-\dfrac{17}{2}=\dfrac{74}{6}-\dfrac{51}{6}=\dfrac{23}{6}\)
b) \(3\dfrac{5}{6}+2\dfrac{1}{6}.6=\dfrac{23}{6}+\dfrac{13}{6}.6=\dfrac{23}{6}+\dfrac{78}{6}=\dfrac{101}{6}\)
c) \(3\dfrac{1}{2}+4\dfrac{5}{7}-5\dfrac{5}{14}=\dfrac{7}{2}+\dfrac{33}{7}-\dfrac{75}{14}=\dfrac{49}{14}+\dfrac{66}{14}-\dfrac{75}{14}=-\dfrac{92}{14}=-\dfrac{46}{7}\)
d) \(4\dfrac{1}{2}+\dfrac{1}{2}:5\dfrac{1}{2}=\dfrac{9}{2}+\dfrac{1}{2}:\dfrac{11}{2}=\dfrac{9}{2}+\dfrac{1}{2}.\dfrac{2}{11}=\dfrac{9}{2}+\dfrac{1}{11}=\dfrac{99}{22}+\dfrac{2}{22}=\dfrac{101}{22}\)
8 tháng 8 2023
a. \(12\dfrac{1}{3}-\left(3\dfrac{3}{4}+4\dfrac{3}{4}\right)=\dfrac{37}{3}-\left(\dfrac{15}{4}+\dfrac{19}{4}\right)\)
\(=\dfrac{37}{3}-\dfrac{34}{4}=\dfrac{23}{6}\)
\(b.3\dfrac{5}{6}+2\dfrac{1}{6}.6=\dfrac{23}{6}+13=\dfrac{101}{6}\)
\(c.3\dfrac{1}{2}+4\dfrac{5}{7}-5\dfrac{5}{14}=\dfrac{7}{2}+\dfrac{33}{7}-\dfrac{75}{14}=\dfrac{20}{7}\)
d \(4\dfrac{1}{2}+\dfrac{1}{2}:5\dfrac{1}{2}\)
\(=\dfrac{9}{2}+\dfrac{1}{2}:\dfrac{11}{2}\)
\(=\dfrac{9}{2}+\dfrac{1}{11}\)
\(=\dfrac{101}{22}\)
3 tháng 7 2017
1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9=2+4+6+8+10+12+14+16+18
=(2+8)+(4+6)+10+(12+18)+(14+16)
=10+10+10+30+30
=30+30+30
=30x3
=90
9 tháng 5 2019
\(\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}:7+\frac{6}{5}\)
\(=\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}\times\frac{1}{7}+\frac{6}{5}\)
\(=\frac{3}{5}\times\left(\frac{6}{7}+\frac{1}{7}\right)+\frac{6}{5}\)
\(=\frac{3}{5}\times1+\frac{6}{5}\)
\(=\frac{3}{5}+\frac{6}{5}=\frac{9}{5}\)
~ Hok tốt ~
9 tháng 5 2019
\(\frac{29}{12}:\frac{1}{2}-\frac{5}{12}:\frac{1}{2}-\frac{1}{2}\)
\(=\left(\frac{29}{12}-\frac{5}{12}\right):\frac{1}{2}-\frac{1}{2}\)
\(=2:\frac{1}{2}-\frac{1}{2}\)
\(=4-\frac{1}{2}=\frac{7}{2}\)
~ Hok tốt ~
HT
1
AH
6 tháng 12 2018
\(\frac{2}{3}+\frac{1}{4}+\frac{1}{12}=\frac{8}{12}+\frac{3}{12}+\frac{1}{12}=\frac{12}{12}=1\)
\(\frac{4}{5}-\frac{1}{2}-\frac{1}{4}=\frac{16}{20}-\frac{10}{20}-\frac{5}{20}=\frac{1}{20}\)
\(\frac{6}{7}\times\frac{5}{8}\times\frac{14}{15}=\frac{6\times5\times14}{7\times8\times15}=\frac{2\times3\times5\times2\times7}{7\times2\times2\times2\times5\times3}=\frac{1}{2}\)
\(\frac{12}{35}-\frac{4}{7}\times\frac{1}{6}=\frac{12}{35}-\frac{4}{42}=\frac{26}{105}\)
NT
0
TQ
1
12 tháng 3 2017
\(\frac{1+3^4+3^8+3^{12}}{1+3^2+3^4+3^6+3^8+3^{10}+3^{12}+3^{14}}\)
\(=\frac{\left(3^{14}-1\right):\left(3^4-1\right)}{\left(3^{14}-1\right):\left(3^2-1\right)}\)
\(=\frac{3^2-1}{3^4-1}=\frac{9-1}{81-1}=\frac{8}{10}=\frac{1}{10}\)
CM
2 tháng 4 2019
12 + 3 = 15 13 + 6 = 19 12 + 1 = 13
14 + 4 = 18 12 + 2 = 14 16 + 2 = 18
13 + 0 = 13 10 + 5 = 15 15 + 0 = 15
15 tháng 2 2022
12 + 3 = 15 13 + 6 = 19 12 + 1 = 13
14 + 4 = 18 12 + 2 = 14 16 + 2 = 18
13 + 0 = 13 10 + 5 = 15 15 + 0 = 15
BV
0
1 = 6/6 = 14/14 =.../... 2 = 4/2 = 6/3 = 12/6