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\(\dfrac{35}{25}\text{=}\dfrac{35\times14}{25\times14}\text{=}\dfrac{490}{350}\)
\(\dfrac{16}{14}\text{=}\dfrac{16\times25}{14\times25}\text{=}\dfrac{400}{350}\)
\(\dfrac{35}{25}\)=\(\dfrac{35\text{∙}14}{25\text{∙}14}\)=\(\dfrac{490}{350}\)=\(\dfrac{7}{5}\)
\(\dfrac{16}{14}\)=\(\dfrac{16\text{∙}25}{14\text{∙}25}\)=\(\dfrac{400}{350}\)=\(\dfrac{8}{7}\)
1/3 và 3/4
Ta có : \(\frac{1}{3}\)= \(\frac{1x4}{3x4}\)=\(\frac{4}{12}\)
\(\frac{3}{4}\)= \(\frac{3x3}{4x3}\)= \(\frac{9}{12}\)
a)\(\frac{1}{3}\)= \(\frac{1x4}{3x4}\)= \(\frac{4}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)= \(\frac{9}{12}\)
b) \(\frac{3}{2}\)=\(\frac{3x21}{2x21}\)=\(\frac{63}{42}\)
\(\frac{2}{3}\)=\(\frac{2x14}{3x14}\)=\(\frac{28}{42}\)
\(\frac{5}{7}\)=\(\frac{5x6}{7x6}\)=\(\frac{30}{42}\)
\(\dfrac{14}{16}\text{=}\dfrac{7}{8}\text{=}\dfrac{7\times7}{8\times7}\text{=}\dfrac{49}{56}\)
\(\dfrac{24}{21}\text{=}\dfrac{8}{7}\text{=}\dfrac{8\times8}{7\times8}\text{=}\dfrac{64}{56}\)
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\(\dfrac{128}{56}\times\dfrac{23}{14}\)
\(=\dfrac{2944}{784}=\dfrac{184}{49}\)
BCCN(56,14)=56
- ta giữ nguyên 128/56
=>23/14 x 4/4 =92/56
128/56 x 92/56 =184/49 <- rút gọn rùi nha !!!