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a, 2.9.5.7.4.25=(2.5).(25.4).(7.9)
=10.100.63=63000
câu b làm tương tự tích giúp mình nha
a, \(\frac{2}{5}\)x ( \(\frac{3}{7}\)+\(\frac{4}{7}\))
= \(\frac{2}{5}\)x \(\frac{7}{7}\)
= \(\frac{2}{5}\)x 1
= \(\frac{2}{5}\)
b, \(\frac{47}{19}\) :\(\frac{15}{32}\) - \(\frac{47}{19}\) :\(\frac{15}{17}\)
= \(\frac{47}{19}\) × \(\frac{32}{15}\) - \(\frac{47}{19}\) × \(\frac{17}{15}\)
= \(\frac{47}{19}\) × (\(\frac{32}{15}\)-\(\frac{17}{15}\))
= \(\frac{47}{19}\) × 1
= \(\frac{47}{19}\)
a) \(\frac{18}{15}+\frac{7}{15}+\frac{12}{15}\)
= \(\frac{18+7+12}{15}\)
= \(\frac{37}{15}\)
b) \(\frac{9}{7}+\frac{8}{7}+\frac{11}{7}\)
= \(\frac{9+8+11}{7}\)
= \(\frac{28}{7}\)
a) 18/15 + 7/15 + 12/15
= (18/15 + 12/15) + 7/15
= 30/15 + 7/15
= 37/15
b) 9/7 + 8/7 + 11/7
= (9/7 + 11/7) + 8/7
= 20/7 + 8/7
= 28/7
chuc ban hok tot
a) 3/7+5/2+4/7
=(3/7+4/7)+5/2
=1+5/2
=7/2
b)6/8+4/5+1/4
=(6/8+1/4)+4/5
=1+4/5
=9/5
đến đó thôi mệt quá
a; \(\dfrac{3}{7}\) + \(\dfrac{5}{2}\) + \(\dfrac{4}{7}\)
= (\(\dfrac{3}{7}+\dfrac{4}{7}\)) + \(\dfrac{5}{2}\)
= 1 + \(\dfrac{5}{2}\)
= \(\dfrac{2}{2}+\dfrac{5}{2}\)
= \(\dfrac{7}{2}\)
b; \(\dfrac{6}{8}\) + \(\dfrac{4}{5}\) + \(\dfrac{1}{4}\)
= \(\dfrac{1}{4}\) + \(\dfrac{4}{5}\) + \(\dfrac{1}{4}\)
= (\(\dfrac{1}{4}\) + \(\dfrac{1}{4}\)) + \(\dfrac{4}{5}\)
= \(\dfrac{2}{4}\) + \(\dfrac{4}{5}\)
= \(\dfrac{1}{2}\) + \(\dfrac{4}{5}\)
= \(\dfrac{5}{10}\) + \(\dfrac{8}{10}\)
= \(\dfrac{13}{10}\)
a) 739 x 2 + 739 + 739 x 3 + 739 x 4
= 739 x 2 + 739 x 1 + 739 x 3 + 739 x 4
= 739 x ( 2 + 1 + 3 + 4 )
= 739 x 10
= 7390
b) \(\frac{1}{7}\) + \(\frac{2}{7}\) + \(\frac{3}{7}\)+ \(\frac{4}{7}\) + \(\frac{5}{7}\) + \(\frac{6}{7}\)
= ( \(\frac{1}{7}\) + \(\frac{6}{7}\) ) + ( \(\frac{2}{7}\) + \(\frac{5}{7}\) ) + ( \(\frac{3}{7}\)+ \(\frac{4}{7}\) )
= \(1\) \(+\) \(1\) \(+\) \(1\)
= \(3\)
~ Hok T ~
a) 18/15 + 7/15 + 12/15 =18/15 + 12/15 + 7/15
= 30/15 + 7/15
= 37/15
b) 9/7 + 8/7 +11/7 = 9/7 + 11/7 + 8/7
= 20/7 + 8/7 = 28/7 nha . tk mk nhé b