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b) 4 1/8 : (4 - 1/4) = 33 /8 : ( 16/4 - 1/4) = 33/8 : 15/4 = 11/10
c) 1 4/35 + 3 4/7 * 3 1/5 = 39/35 + 25/7 * 16/5 = 39/35 + 80/7 = 39/35 + 400/35 = 439/35
a)\(3\frac{2}{5}.2\frac{1}{7}=\frac{17}{5}.\frac{15}{7}=\frac{51}{7}\)
b) \(8\frac{1}{6}:2\frac{1}{2}=\frac{49}{6}:\frac{5}{2}=\frac{49}{6}.\frac{2}{5}=\frac{49}{15}\)
7/3/8 - 4/5/8 = 59/8 - 37/8 = 12
2/1/4 +5/1/4 = 9/4 + 21/4 = 15/2
3/1/4 x 2/3/5 = 13/4 x 13/5 =11/20
\(7\frac{3}{8}-4\frac{5}{8}=\frac{59}{8}-\frac{37}{8}=\frac{22}{8}\)\(=\)\(2,75\)
\(2\frac{1}{4}+5\frac{1}{4}=\frac{9}{4}+\frac{21}{4}=\frac{30}{4}=7,5\)
\(3\frac{1}{4}\times2\frac{3}{5}=\frac{13}{4}\times\frac{13}{5}=\frac{169}{20}=8,45\)
#Minyun
1 4/35 + 3 4/7 * 3 1/5 = 39/35 + 25/7 * 16/5 = 39/35 + 80/7 = 39/35 + 400/35 = 439/35
\(1\dfrac{4}{35}+3\dfrac{4}{7}\times3\dfrac{1}{5}=\dfrac{39}{35}+\dfrac{25}{7}\times\dfrac{16}{5}=\dfrac{39}{35}+\dfrac{80}{7}=\dfrac{39}{35}+\dfrac{400}{35}=\dfrac{39+400}{35}=\dfrac{439}{35}\)
Bài 1:
a) \(2\)\(\dfrac{2}{3}\)\(=\dfrac{8}{3}\)
b) \(1\)\(\dfrac{5}{7}=\dfrac{12}{7}\)
9 2/7+5 3/7=65/7+38/7=103/7
10 3/10-4 7/10=103/10-47/10=56/10
thời xưa chắc không có ghi vở
\(3\frac{1}{2}=\frac{3.2+1}{2}=\frac{7}{2}\)
\(13\frac{2}{3}=\frac{13.3+2}{3}=\frac{41}{3}\)
\(5\frac{7}{8}=\frac{5.8+7}{8}=\frac{47}{8}\)
\(17\frac{1}{4}=\frac{17.4+1}{4}=\frac{69}{4}\)
\(4\frac{2}{9}=\frac{4.9+2}{9}=\frac{38}{9}\)
\(21\frac{5}{9}=\frac{21.9+5}{9}=\frac{194}{9}\)
\(10\frac{5}{8}=\frac{10.8+5}{8}=\frac{85}{8}\)
\(14\frac{1}{5}=\frac{14.5+1}{5}=\frac{71}{5}\)