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ta có : 52/91=4/7
60/84=5/7
Vì mẫu 2 phân số trên bằng nhau, 4<5 nên 4/7<5/7
hay 52/91<60/84
Vậy ....
1, Rút gọn rồi tính
a) \(\frac{4}{5}+\frac{3}{15}\)
= \(\frac{4}{5}+\frac{1}{5}\)
= \(\frac{5}{5}\)
= \(1\)
b) \(\frac{2}{3}+\frac{32}{24}\)
= \(\frac{2}{3}+\frac{4}{3}\)
= \(\frac{6}{3}\)
= \(2\)
c) \(\frac{5}{6}+\frac{15}{18}\)
= \(\frac{5}{6}+\frac{5}{6}\)
= \(\frac{10}{6}\)
= \(\frac{5}{3}\)
2, Tính rồi rút gọn
a) \(\frac{8}{15}+\frac{2}{3}\)
= \(\frac{8}{15}+\frac{10}{15}\)
= \(\frac{18}{15}\)
= \(\frac{6}{5}\)
b) \(\frac{3}{7}+\frac{4}{8}\)
= \(\frac{24}{56}+\frac{28}{56}\)
= \(\frac{52}{56}\)
= \(\frac{13}{14}\)
8/15+2/3=18/15
3/7+4/8=52/56=13/14
duyet nha dung 1000000000%
\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}=\frac{6}{5}\)
\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{52}{56}=\frac{13}{14}\)
\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}=\frac{6}{5}\)
\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{21}{56}=\frac{45}{56}\)
\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{6}{5}\)
\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{13}{14}\)
a) 8/15+2/15=8/15+(2x5)/(3x5)
=8/15+10/15=(8+10)/15
=18/15=(18/3)/(15/3)=6/5
b)3/7+4/8=(3x8)/(7x8)+(4x7)/(8x7)
=24/56+28/56=(24+28)/56
=52/56=(52/4)/(56/4)=13/14
a) 8/15+2/3=8/15+10/15=18/15=6/5
b) 3/7+4/8=24/56+28/56=52/56=13/14
TL
\(\frac{2}{3}-\frac{3}{9}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)
\(\frac{7}{5}-\frac{15}{25}=\frac{7}{5}-\frac{3}{5}=\frac{4}{5}\)
\(\frac{3}{2}-\frac{4}{8}=\frac{3}{2}-\frac{1}{2}=\frac{2}{2}\)
nhé
\(\frac{8}{15}\)+\(\frac{2}{3}\)=\(\frac{8}{15}\)+\(\frac{10}{15}\)=\(\frac{18}{15}\)=\(\frac{6}{5}\)
KHUM PÉ ƠI MIK HIN NHỖI MIK KO GẢNH ĐỂ GẢI CHO BẠN GÒI