Hãy viết số 6 dưới dạng số có mẫu số là:3,4,5,6
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a: 5/3=10/6=25/15=35/21
b: 5/7=35/49
6/15=12/30
4/5=16/20
c: 6=216/36=324/54=108/18
a)\(\dfrac{5}{3}=\dfrac{10}{6}=\dfrac{25}{15}=\dfrac{35}{21}\)
b)\(\dfrac{5}{7}=\dfrac{35}{49};\dfrac{6}{15}=\dfrac{12}{30};\dfrac{4}{5}=\dfrac{16}{20}\)
c) \(6=\dfrac{216}{36}=\dfrac{324}{54}=\dfrac{108}{18}\)
+)\(\frac{4}{2}=2\)
+)\(\frac{4}{4}=1\)
+)\(\frac{6}{4}=\frac{3}{2}\)
Ta có:
6 = 1.6 = 2.3; 35 = 5.7
Do đó ta có ba cách viết khác sau đây:
6 35 = 2 7 . 3 5 ; 6 35 = 1 5 . 6 7 ; 6 35 = 1 7 . 6 5
Ta có : 6 = 1 . 6 = 2 . 3; 35 = 5 . 7
Do đó ta có ba cách phân tích khác sau đây:
;
;
.
các phân số đó là :\(\frac{20}{5};\frac{32}{8};\frac{48}{12}\)
Ta có:
15 = 15 1 = 15 × 3 1 × 3 = 45 3 15 = 15 1 = 15 × 5 1 × 5 = 75 5 15 = 15 1 = 15 × 10 1 × 10 = 150 10
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