Question

So sánh các phân số sau:

a)3/15 và 6/18

b)1/2; 3/15; 4/6

c)1345/1612 và 4524/4625

d)7/5; 6/9;4/3; 7/15; 1

Giúp tôi ....

Answer 1

Ta có:\(\frac{3}{15}=\frac{3.2}{15.2}\)

\(\Rightarrow\frac{3}{15}=\frac{1}{5}\)

\(\Rightarrow\frac{6}{18}=\frac{1}{3}\)

\(\Rightarrow\frac{3}{15}< \frac{6}{18}\)

Answer 2

a) 3/15=6/30<6/18 suy ra 3/15<6/18

b)1/2=0.5

3/15=0.2

4/6=0.6

suy ra 4/5>1/2>3/15

Answer 3

a) ta có: \(\frac{3}{15}=\frac{1}{5};\frac{6}{18}=\frac{1}{3}\)

\(\Rightarrow\frac{1}{5}< \frac{1}{3}\Rightarrow\frac{3}{15}< \frac{6}{18}\)

b) ta có: \(\frac{1}{2}=\frac{15}{30};\frac{3}{15}=\frac{1}{5}=\frac{6}{30};\frac{4}{6}=\frac{2}{3}=\frac{20}{30}\)

\(\Rightarrow\frac{6}{30}< \frac{15}{30}< \frac{20}{30}\)

\(\Rightarrow\frac{3}{15}< \frac{1}{2}< \frac{4}{6}\)

c) ta có: \(\frac{1345}{1612}=0,8;\frac{4524}{4625}=0,9\)

\(\Rightarrow0,8< 0,9\Rightarrow\frac{1345}{1612}< \frac{4524}{4625}\)

d) ta có: \(\frac{7}{5}>1;\frac{6}{9}=\frac{2}{3}< 1;\frac{4}{3}>1;\frac{7}{15}< 1;1=1\)

mà \(\frac{7}{5}=\frac{21}{15};\frac{4}{3}=\frac{20}{15}\)

\(\Rightarrow\frac{21}{15}>\frac{20}{15}\Rightarrow\frac{7}{5}>\frac{4}{3}\)

mà \(\frac{6}{9}=\frac{2}{3}=\frac{5}{15}\)

\(\Rightarrow\frac{10}{15}>\frac{7}{15}\Rightarrow\frac{6}{9}>\frac{7}{15}\)

\(\Rightarrow\frac{7}{5}>\frac{4}{3}>1>\frac{6}{9}>\frac{7}{15}\)

Answer 4

a) \(\frac{3}{15}=\frac{1}{5}\)

     \(\frac{6}{18}=\frac{1}{3}\)

mà \(\frac{1}{5}< \frac{1}{3}\)

\(\Rightarrow\) \(\frac{3}{15}< \frac{6}{18}\)

Answer 5

\(a,\frac{3}{15}=\frac{1}{5}\)

\(\frac{6}{18}=\frac{1}{3}\)

\(\frac{1}{5}< \frac{1}{3}=>\frac{3}{15}< \frac{6}{18}\)