Question

hãy chứng tỏ các phân số bằng nhau 

a 3/4;33/44;3333/4444

b 13/15;1313/1515;131313/151515

c 2001/2002;20012001/20022002; 200120012001/200220022002

làm giúp mình cần rất gấp

 

Answer 1

a: \(\dfrac{3}{4}=\dfrac{3\cdot11}{4\cdot11}=\dfrac{33}{44}=\dfrac{33\cdot101}{44\cdot101}=\dfrac{3333}{4444}\)

b: \(\dfrac{13}{15}=\dfrac{13\cdot101}{15\cdot101}=\dfrac{1313}{1515}=\dfrac{1313\cdot\dfrac{10101}{101}}{1515\cdot\dfrac{10101}{101}}=\dfrac{131313}{151515}\)