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\(\frac{3}{4}+\frac{5}{9}:\frac{4}{5}=\frac{3}{4}+\frac{5}{9}\times\frac{5}{4}\)
\(=\frac{3}{4}+\frac{25}{36}=\frac{27}{36}+\frac{25}{36}=\frac{27+25}{36}=\frac{52}{36}=\frac{13}{9}\)
\(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)\)
\(=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)
y + y x 1/3 : 2/9 + y : 2/7 = 360
=> y + y x 1/3 x 9/2 + y x 7/2 = 360
=> y + y x 3/2 + y x 7/2 = 360
=> y x ( 1 + 3/2 + 7/2 ) = 360
=> y x 6 = 360
=> y = 360 : 6
=> y = 60
Vậy y = 60
Chúc bạn học tốt !!!
a) (12/25 + 13/25) + 3/5
= 25/25 + 3/5
= 25/25 + 15/25
= 40/25 = 8/5
b) 3/2 + ( 2/3 + 4/3)
= 3/2 + 1/3
= 15/6
c) ( 3/5 + 7/5) + 3/4
= 10/5 + 3/4
= 55/20 = 11/4
hok tot
nho k nhe
giải : ( ko chép lại đề ....... tự chép )
a) \(\frac{3}{5}\)+( \(\frac{12}{25}\) + \(\frac{13}{25}\))
= \(\frac{3}{5}\)+ 1
= \(\frac{8}{5}\)
b) \(\frac{3}{2}\)+ ( \(\frac{2}{3}\)+\(\frac{4}{3}\))
= \(\frac{3}{2}\)+ 2
= \(\frac{7}{2}\)
c) (\(\frac{3}{5}\)+ \(\frac{7}{5}\))+ \(\frac{3}{4}\)
= 2 + \(\frac{3}{4}\)
= \(\frac{11}{4}\)
hok tốt nha !!!
\(\frac{1}{3}:\frac{6}{7}+\frac{3}{4}:\frac{6}{7}=\frac{1}{3}.\frac{7}{6}+\frac{3}{4}.\frac{7}{6}=\frac{7}{6}.\left(\frac{1}{3}+\frac{3}{4}\right)=\frac{7}{6}.\frac{13}{12}=\frac{91}{72}\)
1/3:6/7+3/4:6/7=(1/3+3/4):6/7=13/12:6/7=13/12x7/6=51/72
\(\frac{7}{4}\) + \(\frac{2}{3}\) = \(\frac{21}{12}\) + \(\frac{8}{12}\) = \(\frac{29}{12}\)