rút gọn phân số sau 35/45 . Hãy giải hộ mình nhé
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\(\frac{72}{84}=\frac{6}{7}\) nha
HT
:)))
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`27/81=(27:27)/(81:27)=1/3`
`57/76=(57:19)/(76:19)=3/4`
`35/84=(35:7)/(84:7)=5/12`
`MSC:12`
`1/3=(1xx4)/(3xx4)=4/12`
`3/4=(3xx3)/(4xx3)=9/12`
`5/12` giữ nguyên
\(\dfrac{27}{81}=\dfrac{1}{3}\); \(\dfrac{57}{76}=\dfrac{3}{4}\); \(\dfrac{35}{84}=\dfrac{5}{12}\)
\(\dfrac{1}{3}=\dfrac{4}{12}\)
\(\dfrac{3}{4}=\dfrac{9}{12}\)
Giữa nguyên 5/12
\(\dfrac{90}{120}=\dfrac{30.3}{30.4}=\dfrac{3}{4}\)
\(\dfrac{15}{25}=\dfrac{5.3}{5.5}=\dfrac{3}{5}\)
\(\dfrac{18}{45}=\dfrac{9.2}{9.5}=\dfrac{2}{5}\)
\(\dfrac{36}{64}=\dfrac{4.9}{4.16}=\dfrac{9}{16}\)
\(\dfrac{32}{72}=\dfrac{8.4}{8.9}=\dfrac{4}{9}\)
\(\dfrac{84}{49}=\dfrac{7.12}{7.7}=\dfrac{12}{7}\)
\(\dfrac{90}{120}=\dfrac{3}{4};\dfrac{15}{25}=\dfrac{3}{5};\dfrac{18}{45}=\dfrac{2}{5};\dfrac{36}{64}=\dfrac{9}{16};\dfrac{32}{72}=\dfrac{4}{9};\dfrac{84}{49}=\dfrac{12}{7}\)
Ta có : \(\frac{a}{b}=\frac{3}{4}\)(1)
\(\frac{a+15}{b}=\frac{7}{6}\)
\(\Rightarrow\frac{a}{b}+\frac{15}{b}=\frac{7}{6}\)(2)
Thay (1) vào (2) ta có :
\(\frac{3}{4}+\frac{15}{b}=\frac{7}{6}\)
\(\Rightarrow\frac{15}{b}=\frac{7}{6}-\frac{3}{4}\)
\(\Rightarrow\frac{15}{b}=\frac{5}{12}\)
\(\Rightarrow5b=12.15\)
\(\Rightarrow b=12.15:5\)
\(\Rightarrow b=36\)
Thay b\(\Rightarrow a=27\) vào (1) ta có :
\(\frac{a}{b}=\frac{a}{36}=\frac{3}{4}\)
\(\Rightarrow4a=36.3\)
\(\Rightarrow a=36.3:4\)
\(\Rightarrow a=27\)
\(\Rightarrow\frac{a}{b}=\frac{27}{36}\)
Rút gọn:
\(\frac{35}{45}=\frac{35}{45}:\frac{5}{5}=\frac{7}{9}\)
HT
35/45 = 35 : 5 / 45 : 5 = 7/9 nhé