Question

Answer 1

Bài 2:

\(\dfrac{1}{2}=\dfrac{6}{12};\dfrac{1}{3}=\dfrac{4}{12};\dfrac{5}{4}=\dfrac{15}{12};\dfrac{5}{6}=\dfrac{10}{12}\)

mà 4<6<10<15

nên \(\dfrac{1}{3}< \dfrac{1}{2}< \dfrac{5}{6}< \dfrac{5}{4}\)

=>Phân số gần với 1 nhất là \(\dfrac{5}{6}\)

Bài 4:

25/35=5/7

mà \(\dfrac{5}{7}=\dfrac{5\cdot9}{7\cdot9}=\dfrac{45}{63}\)

nên phân số cần tìm là \(\dfrac{45}{63}\)

Bài 3:

\(3=\dfrac{3\cdot4}{1\cdot4}=\dfrac{12}{4};9=\dfrac{9\cdot4}{1\cdot4}=\dfrac{36}{4};12=\dfrac{12\cdot4}{1\cdot4}=\dfrac{48}{4}\)

\(1=\dfrac{1\cdot4}{1\cdot4}=\dfrac{4}{4};0=\dfrac{0\cdot4}{1\cdot4}=\dfrac{0}{4}\)