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\(\left(\frac{3}{8}+-\frac{3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
\(=\left(\frac{9}{24}+-\frac{18}{24}+\frac{14}{24}\right):\frac{5}{6}+\frac{1}{2}\)
\(=\frac{5}{24}:\frac{5}{6}+\frac{1}{2}\)
\(=\frac{5}{24}.\frac{6}{5}+\frac{1}{2}\)
\(=\frac{1}{4}+\frac{1}{2}\)
\(=\frac{1}{4}+\frac{2}{4}\)
\(=\frac{3}{4}\)
\(\frac{1}{2}+\frac{3}{4}-\left(\frac{3}{4}-\frac{4}{5}\right)\)
\(=\frac{1}{2}+\frac{3}{4}-\left(\frac{15}{20}-\frac{16}{20}\right)\)
\(=\frac{1}{2}+\frac{3}{4}-\frac{-1}{20}\)
\(=\frac{10}{20}+\frac{15}{20}-\frac{-1}{20}\)
\(=\frac{25}{20}-\frac{-1}{20}\)
\(=\frac{26}{20}\)
\(=\frac{13}{10}\)
A= 7/8:(4/18-1/18)+7/8:(1/36-15/36)
=7/8:1/6+7/8:(-7/18)
=7/8:(1/6+-7/18)=7/8:(3/18+-7/18)=7/8:(-2/9)=-63/18=-7/2
câu 2:
\(\frac{1}{2}+\frac{1}{6}+...+\frac{1}{2450}\)
\(=\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{49.50}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{49}-\frac{1}{50}\)
\(=1-\frac{1}{50}\)
\(=\frac{49}{50}\)
a)\(=\frac{13}{4}-\frac{1}{3}\)
\(=\frac{35}{12}\)
b)\(=\left(\frac{7}{6}-\frac{1}{2}\right).\frac{2}{3}-\frac{1}{4}\)
\(=\frac{2}{3}.\frac{2}{3}-\frac{1}{4}\left(=1-\frac{1}{4}\right)\)
\(=\frac{4}{9}-\frac{1}{4}\left(=\frac{3}{4}\right)\)
\(=\frac{7}{36}\)
a) ( \(\frac{3}{8}\)+\(\frac{-1}{4}\)+\(\frac{5}{12}\)): \(\frac{2}{3}\)
=(\(\frac{9}{24}\)+\(\frac{-6}{24}\)+\(\frac{10}{24}\)):\(\frac{2}{3}\)
=\(\frac{13}{24}\):\(\frac{2}{3}\)
=\(\frac{13}{16}\)
Câu b) bn tự làm nha , mik đg có việc bận r ....Chúc bn làm tốt
Chú ý : 1 và 4/3 = 1 + 4/3 = 7/3
( 5/12 + 1+4/3 - 0 ,25 ) : 5/8 - 75%
= ( 5/12 + 7/3 - 1/4 ) . 8/5 - 3/4
= ( 5/12 + 28/12 - 3/12 ) . 8/5 - 3/4
= 30/12 . 8/5 - 3/4
= 4 - 3/4
= 16/4 - 3/4
= 13/4
=(5/12+7/3-1/4):5/8-3/4
=(5/12+28/12-1/4):5/8-3/4
=(33/12-1/4):5/8-3/4
=(33/12-3/12):5/8-3/4
=30/12:5/8-3/4
=5/2:5/8-3/4
=5/2x8/5-3/4
=4-3/4
=4/1-3/4
=16/4-3/4
=13/4