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12 tháng 3 2017

=3/4-3/2+1/2:5/12

=3/4-3/2+6/5

=3/4-(3/2-6/5)

=3/4-3/10

=9/20

=

12 tháng 3 2017

9/20 

k hộ nha??

27 tháng 4 2019

\(=\frac{75}{100}-\frac{3}{2}+\frac{1}{2}:\frac{5}{12}-\left(-\frac{1}{3}\right)^2\)

\(=\frac{3}{4}-\frac{3}{2}+\frac{6}{5}-\frac{1}{9}\)

\(=\frac{-3}{4}+\frac{6}{5}-\frac{1}{9}\)

\(=\frac{9}{20}-\frac{1}{9}\)

\(=\frac{61}{180}\)

\(\frac{75}{100}-1\frac{1}{2}+0,5:\frac{5}{12}-\left(-\frac{1}{2}\right)^3\)

\(\frac{3}{4}-\frac{3}{2}+\frac{1}{2}:\frac{5}{12}-\frac{-1}{8}\)

\(\frac{3}{4}-\frac{6}{4}+\frac{1}{2}\cdot\frac{12}{5}-\frac{-1}{8}\)

\(-\frac{3}{4}+\frac{6}{5}-\frac{-1}{8}=\frac{-30}{40}+\frac{48}{40}+\frac{-6}{40}=\frac{12}{40}=\frac{3}{10}\)

CHÚC BN HK TỐT #

27 tháng 4 2019

\(=-\frac{3}{4}+\frac{6}{5}-\left(\frac{-1}{8}\right)\))

=\(-\frac{3}{4}+\frac{6}{5}+\frac{1}{8}\)

=\(\frac{9}{20}+\frac{1}{8}\)

=\(\frac{23}{40}\)

Vậy..........

27 tháng 4 2019

\(\frac{75}{100}-1\frac{1}{2}+0,5:\frac{5}{12}-\left(-\frac{1}{2}\right)^3\)

\(\frac{3}{4}-\frac{3}{2}+\frac{6}{5}+\frac{1}{8}\)

\(\frac{30}{40}-\frac{60}{40}+\frac{48}{40}+\frac{5}{40}\)

\(\frac{23}{40}\)

2 tháng 4 2016

\(75\%-1\frac{1}{2}+0,5:\frac{5}{12}\)

\(=\frac{3}{4}-\frac{3}{2}+\frac{1}{2}.\frac{12}{5}\)

\(=\frac{3}{4}-\frac{3}{2}+\frac{6}{5}\)

\(=\frac{15}{20}-\frac{30}{20}+\frac{24}{20}\)

\(=\frac{9}{20}\)

2 tháng 4 2016

bt rùi nhưng ko chắc lắm

\(\frac{5}{7}\times\frac{1}{3}-\frac{5}{7}\times\frac{1}{4}-\frac{5}{7}\times\frac{1}{2}\)

\(=\frac{5}{7}\times\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{2}\right)\)

\(=\frac{5}{7}\times\left(\frac{4}{12}-\frac{3}{12}-\frac{6}{12}\right)\)

\(=\frac{5}{7}\times\left(\frac{4-3-6}{12}\right)\)

\(=\frac{5}{7}\times\frac{-5}{12}\)

\(=\frac{5\times\left(-5\right)}{7\times12}\)

\(=\frac{-25}{84}\)

3 tháng 5 2019

\(\frac{5}{7}.\frac{1}{3}-\frac{5}{7}.\frac{1}{4}-\frac{5}{7}.\frac{1}{2}\)

\(\frac{5}{7}.\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{2}\right).1\)

\(=\frac{5}{7}.\frac{-5}{12}\)

\(=-\frac{25}{84}\)

10 tháng 5 2016

\(a,\frac{-7}{25}.\frac{11}{13}+\frac{-7}{25}.\frac{2}{13}-\frac{18}{25}\)

\(=\frac{-7}{25}.\left(\frac{11}{13}+\frac{2}{13}\right)-\frac{18}{25}=\frac{-7}{25}-\frac{18}{25}=-1\)

\(b,\frac{5}{7}.\frac{1}{3}-\frac{5}{7}.\frac{1}{4}-\frac{5}{7}.\frac{1}{12}=\frac{5}{7}.\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{12}\right)=\frac{5}{7}.\left(\frac{4}{12}-\frac{3}{12}-\frac{1}{12}\right)\)

\(=\frac{5}{7}.0=0\)

10 tháng 5 2016

c)\(5\frac{2}{5}.4\frac{2}{7}+5\frac{5}{7}.5\frac{2}{5}=\frac{27}{5}.\frac{30}{7}+\frac{40}{7}.\frac{27}{5}=\frac{27}{5}.\left(\frac{30}{7}+\frac{40}{7}\right)\)

\(=\frac{27}{5}.10=27.2=54\)

\(d,75\%-1\frac{1}{2}+0,5:\frac{5}{12}-\left(\frac{-1}{2}\right)^2=\frac{3}{4}-\frac{3}{2}+\frac{1}{2}.\frac{12}{5}-\frac{1}{4}\)

\(=\left(\frac{3}{4}-\frac{1}{4}\right)-\frac{3}{2}+\frac{6}{5}=\frac{1}{2}-\frac{3}{2}+\frac{6}{5}=-1+\frac{6}{5}=\frac{-5}{5}+\frac{6}{5}=\frac{1}{5}\)

13 tháng 6 2020

bài 2:thực hiện phép tính

a. 75% - 112+0,5:512

= \(\dfrac{3}{4}-\dfrac{3}{2}+\dfrac{1}{2}:\dfrac{5}{12}\)

\(= \dfrac{9}{20} \)

b, -114.(−2)25+15:2

\(= \dfrac{-5}{4}.\dfrac{4}{5}+\dfrac{1}{10}\)

\(= \dfrac{-9}{10}\)

14 tháng 6 2020

ko de

3/4-3/2+1/2:5/12-1/4

3/4-3/2+1/2.12/5-1/2

3/4-3/2+6/5-1/2

3/4-6/4+6/5-1/2

-3/4+6/5-1/2

-15/20+24/20-10/20

9/20-10/20

-1/20

3/4-3/2+1/2:5/12

3/4-3/2+1/2×12/5

3/4-3/2+5/24

18/24-36/24+5/24

-18/24+5/25

-13/24

-5/4×4/5+1/5×1/2

-1+1/5×1/2

-1+1/10

1/10