idonno

giupminhdi

a 1/4 va 1/2 

1/4<1/2

2/3>2/5

5/6=45/54(5/6)

cậu này đễ mà bạn

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Lời giải:
\(=\frac{5.2^2.2^{30}.3^{20}-2^2.3^{21}.2^{30}}{5.2.2^{20}.5^{10}.2^{20}.3^{20}-2^{31}.3^{21}}=\frac{5.2^{32}.3^{20}-2^{32}.3^{21}}{5^{11}.2^{41}.3^{20}-2^{31}.3^{21}}\\ =\frac{2^{32}.3^{20}(5-3)}{2^{31}.3^{20}(5^{11}.2^{10}-3)}\\ =\frac{2^{33}.3^{20}}{2^{31}.3^{20}(5^{11}.2^{10}-3)}=\frac{4}{5^{11}.2^{10}-3}\)

a)\(\frac{16}{20}=\frac{4}{5};\frac{9}{15}=\frac{3}{5}\)

Vì 4>3\(\Rightarrow\frac{4}{5}>\frac{3}{5}\) hay \(\frac{16}{20}>\frac{9}{15}\)

Vậy \(\frac{16}{20}>\frac{9}{15}\)

b) \(\frac{6}{8}=\frac{3}{4};\frac{3}{12}=\frac{1}{4}\)

Vì 3>1 \(\Rightarrow\frac{3}{4}>\frac{1}{4}\) hay \(\frac{6}{8}=\frac{3}{12}\)

Vậy \(\frac{6}{8}=\frac{3}{12}\)

c) \(\frac{15}{25}=\frac{3}{5};\frac{36}{45}=\frac{4}{5}\)

Vì 3<4 \(\Rightarrow\frac{3}{5}<\frac{4}{5}\) hay \(\frac{15}{25}<\frac{36}{45}\)

Vậy \(\frac{15}{25}<\frac{36}{45}\)

Neu ban nao dung thi minh tich cho nhe

_{minh khong biet dap an cua cau hoi nay}