Bài 1:
a: \(\dfrac{475}{450}=\dfrac{19}{18}\)
b: \(\dfrac{14\cdot18}{21\cdot36}=\dfrac{2}{3}\cdot\dfrac{1}{2}=\dfrac{1}{3}\)
c: \(\dfrac{15\cdot13-15\cdot17}{4\cdot7+4\cdot8}=\dfrac{15\cdot\left(-4\right)}{15\cdot4}=-1\)
d: \(\dfrac{3\cdot5\cdot7\cdot11\cdot13\cdot37-10101}{1212120+40404}=\dfrac{27}{62}\)