janessa1
janessa1
18-12-2015
Mathematics
contestada
how can i evaluate this expression 3/2-4/7
Respuesta :
Аноним
Аноним
18-12-2015
[tex] \frac{3}{2} - \frac{4}{7} [/tex]
[tex]= \frac{3}{2} + \frac{-4}{7} [/tex]
[tex]= \frac{21}{14} + \frac{-8}{14} [/tex]
[tex]= \frac{21+-8}{14} [/tex]
[tex]= \frac{13}{14} [/tex]
Decimal: 0.928571
Answer Link
dalendrk
dalendrk
18-12-2015
[tex]simple\ method:\\\\\dfrac{a}{b}-\dfrac{c}{d}=\dfrac{ad-bc}{bd}\\==================\\\dfrac{3}{2}-\dfrac{4}{7}=\dfrac{3\cdot7-2\cdot4}{2\cdot7}=\dfrac{21-8}{14}=\boxed{\dfrac{13}{14}}[/tex]
Answer Link
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