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2/3 x 3/4 x 4/5 : 1/5 = 6/12 x 4/5 :1/5 = 24/60 :1/5 = 4/10 : 1/5 = 4/10 x 5/1 = 20/10 = 2
2/5 x 3/4 x 5/6 : 3/4 = 6/20 x 5/6 : 3/4 = 3/10 x 5/6 : 3/4 = 15/60 : 3/4 = 1/4 : 3/4 = 1/4 x 4/3 = 4/12 = 1/3
k cho mk nha!
a) 4/5 x ( 5/4 - 5/7 )
= 4/5 x 15/28
= 21
b) 5/8 x 9/7 + 5/8 x 5/7
= 5/8 x ( 9/7 + 5/7 )
= 5/8 x 2
= 5/4
a, 4/5 x ( 5/4 - 5/7)
=(4/5 x 5/4)- (4/5-5/7)
=1-4/7
=3/7
b, 5/8 x 9/7 -5/8 x 5/7
=5/8 x (9/7 - 5/7 )
=5/8 x 4/7
=5/14
a,\(60\times\left(\frac{7}{12}+\frac{4}{15}\right)\)\(=\frac{60\times7}{12}+\frac{60\times4}{15}\)
\(=\frac{12\times5\times7}{12}+\frac{15\times4\times4}{15}\)
\(=5\times7+4\times4\)
\(=35+16\)
\(=51\)
b, \(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{8}{9}\)\(=\frac{1\times2\times3\times4\times5\times6\times7\times8}{2\times3\times4\times5\times6\times7\times8\times9}\)
\(=\frac{1}{9}\)
2/3 +5/9 - 3/4 =17/36
2/7 :2/3 -1/7 = 2/7
2/5 * 1/4 :3/8 = 4/15 nha bạn
3 x \(\frac{4}{11}\) = \(\frac{3}{1}\) x \(\frac{4}{11}\) = \(\frac{12}{11}\)
1 : \(\frac{5}{4}\) = \(\frac{1\times4}{5}\) = \(\frac{4}{5}\)
\(\frac{4}{5}\) x \(\frac{6}{7}\) + \(\frac{2}{3}\) = \(\frac{24}{35}\) + \(\frac{2}{3}\) = \(\frac{142}{105}\)
\(\frac{3}{4}\) + \(\frac{1}{2}\) : \(\frac{5}{6}\) = \(\frac{3}{4}\) + \(\frac{1}{2}\) x \(\frac{6}{5}\) = \(\frac{3}{4}\)+ \(\frac{6}{10}\) \(\frac{27}{20}\)
\(\frac{3}{4}\)+ \(\frac{1}{2}\) = \(\frac{3}{4}\) + \(\frac{2}{4}\)= \(\frac{5}{4}\)
3/5 + 2/3 + 4/5
=19/15 + 4/5
=31/15
4/9 - 3/14 : 4/7
=4/9 - 3/8
=5/72
Nhớ tích mk nhé !
\(\frac{3}{5}+\frac{2}{3}+\frac{4}{5}=\left(\frac{3}{5}+\frac{4}{5}\right)+\frac{2}{3}\)
=\(\frac{7}{5}+\frac{2}{3}=\frac{21}{15}+\frac{10}{15}=\frac{31}{15}\)
\(\frac{4}{9}-\frac{3}{14}:\frac{4}{7}=\frac{4}{9}-\frac{3}{14}.\frac{7}{4}\)
=\(\frac{4}{9}-\frac{3}{8}=\frac{32}{72}-\frac{27}{72}=\frac{5}{72}\)
a) 4/5 + 4/5 + 4/5 + 4/5 < 4/5
Vì 4/5 + 4/5 + 4/5 + 4/5 = 4/5 x 4
b) 4/5 x 4 < 4/5 x 5
vì 4/5 x 4 = 16/5 và 4/5 x 5 = 4