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6,54 x 5,8 = \(\dfrac{9483}{250}\) = 37,932
220,32 : 6,8 = \(\dfrac{162}{5}\) = 32,4
TL :
Trong dãy số có các số tròn chục là \(10;20;30;40\)
Vậy có \(4\)chữ số 0
HT
\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\)
\(=\frac{16}{32}+\frac{8}{32}+\frac{4}{32}+\frac{2}{32}+\frac{1}{32}\)
\(=\frac{31}{32}\)
Bạn ơi,câu hỏi tương tự nha bạn
BẠN TICK CHO MÌNH NHA,CẢM ƠN BẠN NHIỀU
TL :
\(\frac{1}{2}\): \(\frac{2}{3}\)- \(\frac{1}{5}\)= \(\frac{3}{4}\)- \(\frac{1}{5}\)= \(\frac{11}{20}\)
\(\frac{1}{4}\)x \(\frac{5}{3}\)+ \(\frac{3}{2}\)= \(\frac{5}{12}\)+ \(\frac{3}{2}\)= \(\frac{23}{12}\)
HT
\(\frac{1}{2}\)\(:\frac{2}{3}\)\(-\frac{1}{5}\)
\(=\frac{1}{2}\)\(x\frac{3}{2}\)\(-\frac{1}{5}\)
\(=\frac{3}{4}\)\(-\frac{1}{5}\)
\(=\frac{15}{20}\)\(-\frac{4}{20}\)
\(=\frac{11}{20}\)
Bài 2 :
a, \(3+\dfrac{2}{5}\)
= \(\dfrac{15}{5}+\dfrac{2}{5}\)
= \(\dfrac{17}{5}\)
b, \(4-\dfrac{5}{7}\)
= \(\dfrac{28}{7}-\dfrac{5}{7}\)
= \(\dfrac{23}{7}\)
c, \(1-\left[\dfrac{2}{5}+\dfrac{1}{3}\right]\)
= \(1-\left[\dfrac{6}{15}+\dfrac{5}{15}\right]\)
= \(\dfrac{15}{15}-\dfrac{11}{15}\)
= \(\dfrac{4}{15}\)
Bài 2
a, 3 + \(\dfrac{2}{5}\) = \(\dfrac{15}{5}\) + \(\dfrac{2}{5}\) = \(\dfrac{17}{5}\)
b, 4 - \(\dfrac{5}{7}\) = \(\dfrac{28}{7}\) - \(\dfrac{5}{7}\) = \(\dfrac{23}{7}\)
c, 1 - ( \(\dfrac{2}{5}\) + \(\dfrac{1}{3}\))
= 1 - (\(\dfrac{6}{15}\) + \(\dfrac{5}{15}\))
= 1 - \(\dfrac{11}{15}\)
= \(\dfrac{15}{15}\) - \(\dfrac{11}{15}\)
= \(\dfrac{4}{15}\)
\(\dfrac{5}{6}\) + \(\dfrac{7}{8}\)
= \(\dfrac{5\times4}{6\times4}\) + \(\dfrac{7\times3}{8\times3}\)
= \(\dfrac{20}{24}\) + \(\dfrac{21}{24}\)
= \(\dfrac{41}{24}\)
5/6 + 7/8 = 41/24
2 + 2/3 = 8/3
7/9 - 1/7 = 40/63
1-1/11 =10/11
2x17/81 = 34/81
9/11 : 5/6 = 54/55
3: 12/25 = 25/4
Tick cho mik nhé.
Chúc bạn học tốt nha !
5/3 - 3/4 + 7/12 = 20/12 - 9/12 + 7/12 = 18/12 = 3/2
5/6 : 2 x 18/7 = 5/6 x 1/2 x 18/7 = 90/84 = 15//14
b)\(4\times\dfrac{3}{8}=\dfrac{12}{8}=\dfrac{3}{2}\)
\(3:\dfrac{1}{2}\)
=\(3\times\dfrac{2}{1}\)
= 6
=\(\dfrac{1}{2}:3\)
= \(\dfrac{1}{2}\times\dfrac{1}{3}\)
= \(\dfrac{1}{6}\)
1a, \(\dfrac{3}{10}\) \(\times\) \(\dfrac{4}{9}\)
= \(\dfrac{3\times2\times2}{2\times5\times3\times3}\)
= \(\dfrac{2}{15}\)
\(\dfrac{6}{5}\): \(\dfrac{3}{7}\)
= \(\dfrac{6}{5}\) \(\times\) \(\dfrac{7}{3}\)
= \(\dfrac{14}{5}\)
\(\dfrac{3}{4}\) \(\times\) \(\dfrac{2}{5}\)
= \(\dfrac{3\times2}{2\times2\times5}\)
= \(\dfrac{3}{10}\)
\(\dfrac{5}{8}\) : \(\dfrac{1}{2}\)
= \(\dfrac{5}{8}\) \(\times\) \(\dfrac{2}{1}\)
= \(\dfrac{5}{4}\)
\(\left(\dfrac{2}{5}-\dfrac{1}{4}\right):\dfrac{3}{4}x\dfrac{5}{2}=\dfrac{3}{20}:\dfrac{3}{4}x\dfrac{5}{2}=\dfrac{3}{20}x\dfrac{4}{3}x\dfrac{5}{2}=\dfrac{3x4x5}{20x3x2}=\dfrac{1}{2}\)
`( 2 / 5 - 1 / 4 ) : 3 / 4 xx 5 / 2`
`=( 8 / 20 - 5 / 20 ) xx 4 / 3 xx 5 / 2`
`= 3 / 20 xx 4 / 3 xx 5 / 2`
`= [ 3 xx 4 xx 5 ] / [ 4 xx 5 xx 3 xx 2 ]`
`= 1 / 2`