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\(2-\dfrac{3}{4}x\dfrac{8}{5}+\dfrac{1}{2}\)
\(=2-\dfrac{24}{20}+\dfrac{1}{2}\)
\(=2-\dfrac{24+10}{20}\)
\(=\dfrac{2}{1}-\dfrac{34}{20}=\dfrac{40-34}{20}=\dfrac{6}{20}=\dfrac{3}{10}\)
\(2-\dfrac{3}{4}\times\dfrac{8}{5}+\dfrac{1}{2}=\dfrac{2\times20}{1\times20}-\dfrac{24}{20}+\dfrac{1\times10}{2\times10}\\ =\dfrac{40-24+10}{20}=\dfrac{26}{20}=\dfrac{13}{10}\)
a) \(\dfrac{3}{7}\)
b)\(\dfrac{9}{4}\)
c)\(\dfrac{1}{3}\)
d)\(\dfrac{41}{32}\)
e)\(\dfrac{73}{60}\)
1:tính
\(\frac{5}{8}\)x\(\frac{9}{7}\)+\(\frac{5}{8}\)x\(\frac{5}{7}\)
=\(\frac{5}{8}\)x\((\)\(\frac{9}{7}\)+\(\frac{5}{7}\)\()\)
=\(\frac{5}{8}\)x2
=\(\frac{5}{4}\)
# hok tốt #
\(17\times109-17\times53+56\times96-13\times56\)
\(=17\times\left(109-53\right)+56\times\left(96-13\right)\)
\(=17\times56+56\times83\)
\(=56\times\left(17+83\right)\)
\(=56\times100\)
\(=5600\)
\(8\times27\times3+2\times31\times12+6\times12\times4\)
\(=24\times27+24\times31+24\times12\)
\(=24\times\left(27+31+12\right)\)
\(=24\times70\)
\(=1680\)
\(15\times47+15\times33+60\times39+60\times41\)
\(=15\times\left(47+33\right)+60\times\left(39+41\right)\)
\(=15\times80+60\times80\)
\(=80\times\left(15+60\right)\)
\(=80\times75\)
\(=6000\)
\(97\times59-59\times31-66\times49\)
\(=59\times\left(97-31\right)-66\times49\)
\(=59\times66-66\times49\)
\(=66\times\left(59-49\right)\)
\(=66\times10\)
\(=660\)
Học tốt
\(\frac{5}{9}\times\frac{8}{17}+\frac{4}{9}\times\frac{8}{17}\)
\(=\left(\frac{5}{9}+\frac{4}{9}\right)\times\frac{8}{17}\)
\(=1\times\frac{8}{17}\)
\(=\frac{8}{17}\)
$\frac58\times\frac38+\frac38\times\frac28+\frac18\times\frac38$
$=\frac38\times(\frac58+\frac28+\frac18)$
$=\frac38\times(\frac78+\frac18)$
$=\frac38\times1=\frac38$
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