1 phần 2 chia 0,5 - 1 phần 4 chia 0,25 + 1 phần 8 chia 0,125 - 1 phần 10 chia 0,1
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a; 0,2.\(\dfrac{15}{36}\) - (\(\dfrac{2}{5}\) + \(\dfrac{2}{3}\)): 1%
= \(\dfrac{1}{12}\) - \(\dfrac{16}{15}\): \(\dfrac{1}{100}\)
= \(\dfrac{1}{12}\) - \(\dfrac{320}{3}\)
= \(\dfrac{1}{12}\) - \(\dfrac{1280}{12}\)
= - \(\dfrac{1279}{12}\)
b; 75% - 1\(\dfrac{1}{2}\) + 0,5 : \(\dfrac{5}{12}\)
= 0,75 - 1,5 + 1,2
= -0,75 + 1,2
= 0,45
c; 1\(\dfrac{3}{15}.0,75-\left(\dfrac{8}{15}+0,25\right)\).\(\dfrac{24}{47}\)
= \(\dfrac{28}{15}\).0,75 - \(\dfrac{47}{60}\).\(\dfrac{24}{47}\)
= \(\dfrac{7}{5}-\dfrac{2}{5}\)
= 1
d; \(\dfrac{32}{15}\): (-1\(\dfrac{1}{5}\) + 1\(\dfrac{1}{3}\))
= \(\dfrac{32}{15}\): (-\(\dfrac{6}{5}\) + \(\dfrac{4}{3}\))
= \(\dfrac{32}{15}\): \(\dfrac{2}{15}\)
= 16
A=\(\dfrac{28}{15}\)(\(\dfrac{1}{2}\))\(^2\).3+(\(\dfrac{8}{15}-\dfrac{79}{60}\)):\(\dfrac{47}{24}\) A=28\(\dfrac{28}{15}.\dfrac{1}{4}.3+\dfrac{\left(-47\right)}{60}.\dfrac{24}{47}\) A=\(\dfrac{7}{5}+\dfrac{\left(-2\right)}{5}=\dfrac{5}{5}=1\) Vậy A=1
\(\frac{3}{10}\div\frac{5}{9}+\frac{4}{15}\div\frac{1}{5}\)
\(=\frac{27}{50}+\frac{4}{3}\)
\(=\frac{281}{150}\)
1/4:0,25-1/8:0,125+1/2:0,5-1/10:0,1
=1/4x4-1/8x8+1/2x2-1/10x10
=4/4-8/8+2/2-10/10
=1-1+1-1
=0
1/2 : 0,5 - 1/4 : 0,25 + 1/8 : 0,125 - 1/10 : 0,1
= 1/2 x 2 - 1/4 x 4 + 1/8 x 8 - 1/10 x 10
= 1 - 1 + 1 - 1
= 0
\(\frac{1}{2}\)\(\div\)\(0,5\)\(-\)\(\frac{1}{4}\div0,25\)\(+\)\(\frac{1}{8}\div0,125\)\(-\)\(\frac{1}{10}\div0,1\)
\(=\)\(\frac{1}{2}\)\(\div\)\(\frac{1}{2}\)\(-\)\(\frac{1}{4}\div\frac{1}{4}\)\(+\)\(\frac{1}{8}\div\frac{1}{8}\)\(-\)\(\frac{1}{10}\div\frac{1}{10}\)
\(=\)\(\frac{1}{2}\)\(\times\frac{2}{1}\)\(-\)\(\frac{1}{4}\times\frac{4}{1}\)\(+\)\(\frac{1}{8}\times\frac{8}{1}\)\(-\)\(\frac{1}{10}\times\frac{10}{1}\)
\(=\)\(1-1+1-1\)
\(=\)\(0\)