Tính 1 , 5 4 ; - 2 3 3 ; 3 5
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Bài 1:
a, 3\(\dfrac{2}{5}\) - \(\dfrac{1}{2}\)
= \(\dfrac{17}{5}\) - \(\dfrac{1}{2}\)
= \(\dfrac{34}{10}\) - \(\dfrac{5}{10}\)
= \(\dfrac{29}{10}\)
b, \(\dfrac{4}{5}\) + \(\dfrac{1}{5}\) x \(\dfrac{3}{4}\)
= \(\dfrac{4\times4}{5\times4}\) + \(\dfrac{1\times3}{5\times4}\)
= \(\dfrac{16}{20}\) + \(\dfrac{3}{20}\)
= \(\dfrac{19}{20}\)
c, 4\(\dfrac{4}{9}\) : 2\(\dfrac{2}{3}\) + 3\(\dfrac{1}{6}\)
= \(\dfrac{40}{9}\) : \(\dfrac{8}{3}\) + \(\dfrac{19}{6}\)
= \(\dfrac{5}{3}\) + \(\dfrac{19}{6}\)
= \(\dfrac{10}{6}\) + \(\dfrac{19}{6}\)
= \(\dfrac{29}{6}\)
Bài 2:
3\(\dfrac{2}{5}\) + 2\(\dfrac{1}{5}\)
= \(\dfrac{17}{5}\) + \(\dfrac{11}{5}\)
= \(\dfrac{28}{5}\)
b, 7\(\dfrac{1}{6}\) : 5\(\dfrac{2}{3}\)
= \(\dfrac{43}{6}\) : \(\dfrac{17}{3}\)
= \(\dfrac{43}{34}\)
5 - 1 = 4 1 + 4 = 5 2 + 3 = 5
5 - 2 = 3 4 + 1 = 5 3 + 2 = 5
5 - 3 = 2 5 - 1 = 4 5 - 2 = 3
5 - 4 = 1 5 - 4 = 1 5 - 3 = 2
5-1=4 1+4=5 2+3=5
5-2=3 4+1=4 3+2=5
5-3=2 5-1=4 5-2=3
5-4=1 5-4=1 5-3=2
2 - 1 = 1 3 - 2 = 1 4 - 3 = 1 5 - 4 = 1
3 - 1 = 2 4 - 2 = 2 5 - 3 = 2
4 - 1 = 3 5 - 2 = 3
5 - 1 = 4
Lời giải chi tiết:
2 – 1 = 1 | 3 – 2 = 1 | 4 – 3 = 1 | 5 – 4 = 1 |
3 – 1 = 2 | 4 – 2 = 2 | 5 – 3 = 2. | |
4 – 1 = 3 | 5 – 2 = 3 | ||
5 – 1 = 4 |
Lời giải chi tiết:
2 – 1 = 1 | 3 – 2 = 1 | 4 – 3 = 1 | 5 – 4 = 1 |
3 – 1 = 2 | 4 – 2 = 2 | 5 – 3 = 2. | |
4 – 1 = 3 | 5 – 2 = 3 | ||
5 – 1 = 4 |
\(\dfrac{5}{12}+\dfrac{1}{6}=\dfrac{5}{12}+\dfrac{2}{12}=\dfrac{5+2}{12}=\dfrac{7}{12}\)
\(\dfrac{5}{12}+\dfrac{1}{6}=\dfrac{5}{12}+\dfrac{2}{12}=\dfrac{7}{12}\)
\(1-\dfrac{23}{47}=\dfrac{47}{47}-\dfrac{23}{47}=\dfrac{24}{47}\)
\(\dfrac{4}{5}x\dfrac{7}{8}=\dfrac{4x7}{5x8}=\dfrac{28}{40}=\dfrac{7}{10}\)
\(\dfrac{8}{5}:\dfrac{1}{4}=\dfrac{8}{5}x\dfrac{4}{1}=\dfrac{32}{5}\)
a: =-1/3+1/3=0
b: \(=\dfrac{4}{11}\left(-\dfrac{2}{7}-\dfrac{4}{7}-\dfrac{1}{7}\right)=\dfrac{4}{11}\cdot\left(-1\right)=-\dfrac{4}{11}\)
c: \(=10+\dfrac{5}{9}-3-\dfrac{5}{7}-4-\dfrac{5}{9}=3-\dfrac{5}{7}=\dfrac{16}{7}\)
d: \(=\dfrac{1}{3}+\dfrac{7}{4}-\dfrac{7}{4}+\dfrac{4}{5}=\dfrac{1}{3}+\dfrac{4}{5}=\dfrac{5+12}{15}=\dfrac{17}{15}\)
a: =-1/3+1/3=0
b: =411(−27−47−17)=411⋅(−1)=−411=411(−27−47−17)=411⋅(−1)=−411
c: =10+59−3−57−4−59=3−57=167=10+59−3−57−4−59=3−57=167
d: =13+74−74+45=13+45=5+1215=1715
Lời giải chi tiết:
5 – 1 = 4 | 1 – 1 = 0 | 1 – 0 = 1 |
5 – 2 = 3 | 2 – 2 = 0 | 2 – 0 = 2 |
5 – 3 = 2 | 3 – 3 = 0 | 3 – 0 = 3 |
5 – 4 = 1 | 4 – 4 = 0 | 4 – 0 = 4 |
5 – 5 = 0 | 5 – 5 = 0 | 5 – 0 = 5 |
1 - 0 = 1 1 - 1 = 0 5 - 1 = 4
2 - 0 = 2 2 - 2 = 0 5 - 2 = 3
3 - 0 = 3 3 - 3 = 0 5 - 3 = 2
4 - 0 = 4 4 - 4 = 0 5 - 4 = 1
5 - 0 = 5 5 - 5 = 0 5 - 5 = 0
1 - 0 = 1 1 - 1 = 0 5 - 1 = 4
2 - 0 = 2 2 - 2 = 0 5 - 2 = 3
3 - 0 = 3 3 - 3 = 0 5 - 3 = 2
4 - 0 = 4 4 - 4 = 0 5 - 4 = 1
5 - 0 = 5 5 - 5 = 0 5 - 5 = 0