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\(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)
=\(\dfrac{1}{2}+\dfrac{3}{4}-\dfrac{3}{4}+\dfrac{4}{5}\)
=\(\left(\dfrac{1}{2}+\dfrac{4}{5}\right)+\left(\dfrac{3}{4}-\dfrac{3}{4}\right)\)
=\(\left(\dfrac{5}{10}+\dfrac{8}{10}\right)+0\)
=\(\dfrac{13}{10}\)
\(-\dfrac{7}{25}.\dfrac{11}{13}+\left(-\dfrac{7}{25}\right).\dfrac{2}{13}-\dfrac{18}{25}\)
=\(-\dfrac{7}{25}.\cdot\left(\dfrac{11}{13}+\dfrac{2}{13}\right)-\dfrac{18}{25}\)
=\(-\dfrac{7}{25}.1-\dfrac{18}{25}\)
=\(-\dfrac{7}{25}-\dfrac{18}{25}\)
=\(-\dfrac{25}{25}\) = \(-1\)
bn ơi ko thì bn làm từng phép một cũng đc nhé các bn giải hộ mình mai mình phải nộp rồi
\(a)\)\(6\frac{4}{5}-\left(1\frac{2}{3}+3\frac{4}{5}\right)\)
\(=6\frac{4}{5}-1\frac{2}{3}-3\frac{4}{5}\)
\(=\left(6\frac{4}{5}-3\frac{4}{5}\right)-1\frac{2}{3}\)
\(=\left(6+\frac{4}{5}-3-\frac{4}{5}\right)-\frac{5}{3}\)
\(=3-\frac{5}{3}\)
\(=\frac{9}{3}-\frac{5}{3}\)
\(=\frac{4}{3}\)
\(b)\)\(6\frac{5}{7}-(1\frac{3}{4}+2\frac{5}{7})\)
\(=6\frac{5}{7}-1\frac{3}{4}-2\frac{5}{7}\)
\(=\left(6\frac{5}{7}-2\frac{5}{7}\right)-1\frac{3}{4}\)
\(=\left(6+\frac{5}{7}-2-\frac{5}{7}\right)-\frac{7}{4}\)
\(=4-\frac{7}{4}\)
\(=\frac{16}{4}-\frac{7}{4}\)
\(=\frac{9}{4}\)
\(c)\)\(7\frac{5}{9}-\left(2\frac{3}{4}+3\frac{5}{9}\right)\)
\(=7\frac{5}{9}-2\frac{3}{4}-3\frac{5}{9}\)
\(=\left(7\frac{5}{9}-3\frac{5}{9}\right)-2\frac{3}{4}\)
\(=\left(7+\frac{5}{9}-3-\frac{5}{9}\right)-\frac{11}{4}\)
\(=4-\frac{11}{4}\)
\(=\frac{16}{4}-\frac{11}{4}\)
\(=\frac{5}{4}\)
P/s: Câu b bạn thiếu ngoặc.
Linz
a) 6 và 4/5 - ( 1 và 2/3 + 3 và 4/5)
= 34/5- ( 5/3 + 19/5 )
= 34/5 - 5/3 - 19/5
= (34/5 - 9/5 ) - 5/3
=25/5 -5/3
= 5/1 - 5/3
= 15/3 - 5/3
=10/3
b) 6 và 5/7 - (1 và 3/4 + 2 và 5/7)
=47/7 - (7/4 + 19/7 )
= 47/7 -7/4 - 19/7
= (47/7 -19/7 ) - 7/4
= 28/7 -7/4
=4/1 - 7/4
= 16/4 - 7/4
= 9/4
c) 7 và 5/9 - ( 2 và 3/4 + 3 và 5/9 )
= 68/9 - ( 11/4 + 32/9 )
= 68/9 - 11/4 - 32/9
= (68/9 - 32/9 )- 11/4
= 36/9 -11/4
= 4/1 - 11/4
= 16/4 - 11/4
= 5/4
Chúc bạn học tốt nha!!!!!
dễ mk bn cho mình hỏi nhé câu 4 là \(\frac{1}{2\cdot3}\)hay là\(\frac{1}{2}\cdot3\)
\(\dfrac{8}{9}\) : ( 2 - 3 \(\times\) y) = \(\dfrac{5}{3}\)
2 - 3 \(\times\) y = \(\dfrac{8}{9}\) : \(\dfrac{5}{3}\)
2 - 3 \(\times\) y = \(\dfrac{8}{15}\)
3 \(\times\) y = 2 - \(\dfrac{8}{15}\)
3 \(\times\) y = \(\dfrac{22}{15}\)
y = \(\dfrac{22}{15}\) : 3
y = \(\dfrac{22}{45}\)
Tính:
\(\frac{2}{3}+\frac{3}{4}=\frac{8}{12}+\frac{9}{12}=\frac{17}{12}\)
\(\frac{1}{5}+\frac{3}{2}=\frac{2}{10}+\frac{15}{10}=\frac{17}{10}\)
\(\frac{6}{5}-\frac{2}{3}=\frac{18}{15}-\frac{10}{15}=\frac{8}{15}\)
\(\frac{7}{2}-\frac{3}{4}=\frac{14}{4}-\frac{3}{4}=\frac{11}{4}\)
\(1\frac{2}{5}+\frac{7}{2}=\frac{7}{5}+\frac{7}{2}=\frac{14}{10}+\frac{35}{10}=\frac{49}{10}\)
\(2\frac{1}{8}-\frac{5}{6}=\frac{17}{8}-\frac{5}{6}=\frac{51}{24}-\frac{20}{24}=\frac{31}{24}\)
\(0,75+2\frac{1}{3}=\frac{3}{4}+\frac{7}{3}=\frac{9}{12}+\frac{28}{12}=\frac{37}{12}\)
\(1-\frac{1}{4}-0,25=1-\frac{1}{4}-\frac{1}{4}=\frac{4}{4}-\frac{1}{4}-\frac{1}{4}=\frac{2}{4}=\frac{1}{2}\)
\(\frac{11}{2}-\frac{5}{3}+\frac{7}{4}=\frac{66}{12}-\frac{20}{12}+\frac{21}{12}=\frac{67}{12}\)
\(\frac{5}{6}+1\frac{2}{3}-\frac{1}{4}=\frac{5}{6}+\frac{5}{3}-\frac{1}{4}=\frac{10}{12}+\frac{20}{12}-\frac{3}{12}=\frac{27}{12}=\frac{9}{4}\)
\(0,5+2\frac{3}{5}-\frac{5}{4}=\frac{1}{2}+\frac{13}{5}-\frac{5}{4}=\frac{10}{20}+\frac{52}{20}-\frac{25}{20}=\frac{37}{20}\)
\(3\frac{1}{2}-\frac{5}{6}+1,2=\frac{7}{2}-\frac{5}{6}+\frac{6}{5}=\frac{105}{30}-\frac{25}{30}+\frac{36}{30}=\frac{116}{30}=\frac{58}{15}\)
\(\frac{1}{3}+2\frac{1}{4}=\frac{1}{3}+\frac{9}{4}=\frac{4}{12}+\frac{27}{12}=\frac{31}{12}\)
\(\frac{7}{2}+\frac{3}{4}+\frac{7}{12}=\frac{42}{12}+\frac{9}{12}+\frac{7}{12}=\frac{58}{12}=\frac{29}{6}\)
\(2-\frac{4}{9}-\frac{1}{6}=\frac{36}{18}-\frac{8}{18}-\frac{3}{18}=\frac{25}{18}\)
Chúc bạn hok tốt !!! ღℓїŋɦ✿şʉŋღ