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[4\(\dfrac{1}{5}\) - 2\(\dfrac{2}{5}\)] x 8\(\dfrac{5}{6}\)
= [\(\dfrac{21}{5}\) - \(\dfrac{12}{5}\)] x \(\dfrac{53}{6}\)
= \(\dfrac{9}{5}\) x \(\dfrac{53}{6}\)
= \(\dfrac{159}{10}\)
[5\(\dfrac{1}{3}\) - 2\(\dfrac{2}{3}\)]: \(\dfrac{3}{7}\)
= [\(\dfrac{16}{3}\) - \(\dfrac{8}{3}\)]: \(\dfrac{3}{7}\)
= \(\dfrac{8}{3}\) : \(\dfrac{3}{7}\)
= \(\dfrac{56}{9}\)
Bài 1: tính: a) 8 và 5/9 : 5 và 1/2 b) 7 và 3/4 - 2 và 1/8 c) 1 và 3/4 x 2 và 5/6 d) 7 - 2 và 2/3 e) 2 và 3/7 x 1 và 3/4 g) 5 và 1/3 : 3 và 1/5 Bài 2: tìm X: X : 3 và 1/3= 2 và 2/5 + 7/10 Và là biểu thị cho hỗn số nhé
a: \(2\dfrac{2}{10}=2,2\)
\(4\dfrac{31}{100}=4,31\)
9/10=0,9
51/10=5,1
75/100=0,75
125/100=1,25
1075/1000=1,075
\(14\dfrac{17}{100}=14,17\)
b: 1/2=0,5
3/4=0,75
4/5=0,8
5/8=0,625
\(2\dfrac{1}{2}=2,5\)
\(3\dfrac{1}{4}=3,25\)
\(1\dfrac{3}{5}=1,6\)
\(4\dfrac{3}{8}=4,375\)
Bài 1:
Quy đồng mẫu số các phân số:
a; \(\dfrac{2}{5}\) và \(\dfrac{3}{4}\); \(\dfrac{2}{5}\) = \(\dfrac{2\times4}{5\times4}\) = \(\dfrac{8}{20}\); \(\dfrac{3}{4}\) = \(\dfrac{3\times5}{4\times5}\) = \(\dfrac{15}{20}\)
b; \(\dfrac{2}{7}\) và \(\dfrac{5}{14}\); \(\dfrac{2}{7}\) = \(\dfrac{2\times2}{7\times2}\) = \(\dfrac{4}{14}\)
c; \(\dfrac{4}{9}\) và \(\dfrac{5}{27}\); \(\dfrac{4}{9}\) = \(\dfrac{4\times3}{9\times3}\) = \(\dfrac{12}{27}\);
d; \(\dfrac{2}{3};\dfrac{4}{5}\);\(\dfrac{5}{6}\)
\(\dfrac{2}{3}\) = \(\dfrac{2\times10}{3\times10}\) = \(\dfrac{20}{30}\); \(\dfrac{4}{5}\) = \(\dfrac{4\times6}{5\times6}\) = \(\dfrac{24}{30}\); \(\dfrac{5\times5}{6\times5}\) = \(\dfrac{25}{30}\)
Bài 1
a) 3 2/5 - 1/2
= 17/5 - 1/2
= 34/10 - 5/10
= 29/10
b) 4/5 + 1/5 × 3/4
= 4/5 + 3/20
= 16/20 + 3/20
= 19/20
c) 3 1/2 × 1 1/7
= 7/2 × 8/7
= 4
d) 4 1/6 : 2 1/3
= 25/6 : 7/3
= 25/14
Bài 2
a) 3 × 1/2 + 1/4 × 1/3
= 3/2 + 1/12
= 18/12 + 1/12
= 19/12
b) 1 4/5 - 2/3 : 2 1/3
= 9/5 - 2/3 : 7/3
= 9/5 - 2/7
= 63/35 - 10/35
= 53/35
a) \(3\dfrac{1}{2}-1\dfrac{1}{4}\times1\dfrac{5}{6}\)
\(=\dfrac{7}{2}-\dfrac{5}{4}\times\dfrac{11}{6}\)
\(=\dfrac{7}{2}-\dfrac{55}{24}\)
\(=\dfrac{84}{24}-\dfrac{55}{24}\)
\(=\dfrac{29}{24}\)
b) \(2\dfrac{5}{6}+1\dfrac{2}{3}\div3\dfrac{3}{4}\)
\(=\dfrac{17}{6}+\dfrac{5}{3}\div\dfrac{15}{4}\)
\(=\dfrac{17}{6}+\dfrac{5}{3}\times\dfrac{4}{15}\)
\(=\dfrac{17}{6}+\dfrac{4}{9}\)
\(=\dfrac{153}{54}+\dfrac{24}{54}\)
\(=\dfrac{59}{18}\)
\(a,4\dfrac{1}{4}-2=\dfrac{17}{4}-2=\dfrac{9}{4};\dfrac{5}{8}+2\dfrac{3}{5}=\dfrac{5}{8}+\dfrac{13}{5}=\dfrac{129}{40}\\ b,4\dfrac{4}{9}:2=\dfrac{40}{9}\cdot\dfrac{1}{2}=\dfrac{20}{9};\dfrac{2}{3}+3\dfrac{1}{6}=\dfrac{2}{3}+\dfrac{19}{6}=\dfrac{23}{6}\\ c,3\dfrac{1}{5}+2=\dfrac{9}{5}+2=\dfrac{19}{5};\dfrac{3}{5}-2\dfrac{4}{5}=\dfrac{3}{5}-\dfrac{14}{5}=-\dfrac{11}{5}\)
\(d,5\dfrac{1}{7}-2=\dfrac{36}{7}-2=\dfrac{22}{7};\dfrac{4}{5}:1\dfrac{1}{5}=\dfrac{4}{5}:\dfrac{6}{5}=\dfrac{2}{3}\\ e,2\dfrac{3}{5}+1=\dfrac{13}{5}+1=\dfrac{18}{5};\dfrac{1}{4}\cdot2\dfrac{2}{3}=\dfrac{1}{4}\cdot\dfrac{8}{3}=\dfrac{2}{3}\\ f,4\dfrac{1}{3}\cdot1=\dfrac{13}{3};\dfrac{1}{2}+5\dfrac{2}{7}=\dfrac{1}{2}+\dfrac{37}{7}=\dfrac{81}{14}\)
a)\(3\frac{4}{10}>2\frac{9}{10}\)
b)\(3\frac{4}{10}< 3\frac{9}{10}\)
c)\(5\frac{1}{10}>2\frac{9}{10}\)
d)\(3\frac{4}{10}=3\frac{2}{5}\)
Hok tốt!~
a). 3 9/10 > 2 9/10
b).3 4/10 < 3 9/10
c).5 1/10 > 2 9/10
d).3 4/10 = 3 2/5
\(\left(10\dfrac{3}{4}+3\dfrac{4}{5}\right)-\left(5\dfrac{3}{4}-1\dfrac{1}{5}\right)\)
\(=\left(\dfrac{43}{4}+\dfrac{19}{5}\right)-\left(\dfrac{23}{4}-\dfrac{6}{5}\right)\)
\(=\dfrac{43}{4}+\dfrac{19}{5}-\dfrac{23}{4}+\dfrac{6}{5}\)
\(=\left(\dfrac{43}{4}-\dfrac{23}{4}\right)+\left(\dfrac{19}{5}+\dfrac{6}{5}\right)\)
\(=5+5\)
\(=10\)
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