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3/4 x 8/5 x 5/9 = 3/4 x 8/5 x 5/9 = 1/1 x 2/1 x 1/3 = 2/3
6/4 : 3/14 : 1/2 = 6/4 x 14/3 x 2/1 = 2/2 x 14/1 x 1/1 = 14
k mk nha
\(\frac{2}{3}\)x \(\frac{5}{8}\)x \(\frac{8}{15}\)= \(\frac{2}{3}\)x \(\frac{1}{15}\)= \(\frac{2}{45}\)
\(\frac{22}{5}\)x \(12\)x \(\frac{20}{40}\)= \(\frac{22}{5}\)x \(12\)x \(\frac{1}{2}\)= \(\frac{22}{5}\)x 6 = \(\frac{122}{5}\)
\(\frac{7}{2}\)x \(\frac{26}{7}\)x \(\frac{4}{13}\)= \(\frac{91}{7}\)x \(\frac{4}{13}\)
\(\frac{12}{17}:4=\frac{12}{17}.\frac{1}{4}=\frac{3}{17}.\frac{1}{1}=\frac{3}{17}\)
\(12:\frac{6}{13}=12.\frac{13}{6}=2.\frac{13}{1}=26\)
\(9:\frac{3}{5}.\frac{4}{15}=9.\frac{5}{3}.\frac{4}{15}=3.\frac{5}{1}.\frac{4}{15}=\frac{15}{1}.\frac{4}{15}=\frac{1}{1}.\frac{4}{1}=4\)
Hok tốt!!!
[4\(\dfrac{1}{5}\) - 2\(\dfrac{2}{5}\)] x 8\(\dfrac{5}{6}\)
= [\(\dfrac{21}{5}\) - \(\dfrac{12}{5}\)] x \(\dfrac{53}{6}\)
= \(\dfrac{9}{5}\) x \(\dfrac{53}{6}\)
= \(\dfrac{159}{10}\)
[5\(\dfrac{1}{3}\) - 2\(\dfrac{2}{3}\)]: \(\dfrac{3}{7}\)
= [\(\dfrac{16}{3}\) - \(\dfrac{8}{3}\)]: \(\dfrac{3}{7}\)
= \(\dfrac{8}{3}\) : \(\dfrac{3}{7}\)
= \(\dfrac{56}{9}\)
Câu 1:
a. $3\frac{2}{3}+2\frac{1}{2}=(3+2)+(\frac{2}{3}+\frac{1}{2})=5+\frac{7}{6}=6+\frac{1}{6}=6\frac{1}{6}$
b. \(2\frac{1}{2}\times 3\frac{2}{5}=\frac{5}{2}\times \frac{17}{5}=\frac{17}{2}\)
c.
\(3\frac{1}{3}: 4\frac{1}{4}=\frac{10}{3}: \frac{17}{4}=\frac{40}{51}\)
d.
\(3\frac{1}{2}+4\frac{5}{7}-5\frac{5}{14}=(3+4-5)+(\frac{1}{2}+\frac{5}{7}-\frac{5}{14})=2+\frac{6}{7}=2\frac{6}{7}\)
Câu 2:
a. $x\times \frac{2}{7}=\frac{6}{11}$
$x=\frac{6}{11}: \frac{2}{7}=\frac{21}{11}$
b. $x: \frac{3}{2}=\frac{1}{4}$
$x=\frac{1}{4}\times \frac{3}{2}=\frac{3}{8}$
6 2/7 + 7 3/5 + 8 6/9 + 9 1/4 + 2/5 + 5/7 + 1/3 x 3/4 + 1967
= 44/7 + 38/5 + 78/9 + 37/4 + 2/5 + 5/7 + 1/3 + 1967
= ( 44/7 + 5/7 ) + ( 38/5 + 2/5 ) + ( 26/3 + 1/3 ) + ( 37/4 + 3/4 ) +1967
= 7 + 8 + 9 + 10 + 1967
= 15 + 9 + 10 + 1967
= 24 + 10 + 1967
= 34 + 1967
= 2001
"chia" chứ không phải "cia" nhé bạn
=\(\frac{7}{105}\)nhé bạn
Gọi số đó là a. => a+1 chia hết cho 2;3;4;5;6;7;8;9;10 => a+1 thuộc BC(2;3;4;5;6;7;8;9;10) nhưng vì a nhỏ nhất nên a+1 = BCNN(2;3;4;5;6;7;8;9;10)=2520 => a = 2520 -1 => a = 2519
\(\dfrac{3}{2}\) x \(\dfrac{4}{9}\) : \(\dfrac{5}{6}\)
= \(\dfrac{2}{3}\) : \(\dfrac{5}{6}\)
= \(\dfrac{2}{3}\) x \(\dfrac{6}{5}\)
= \(\dfrac{4}{5}\)
3/2 x 4/9 : 5/6
= 12/18 : 5/6
= 12/18 x 6/5
= 72/90
= 4/5