Question

1) Rút gọn p/s:

a) 6*9 - 2*17 / 63*3 - 119

b) 2*3 + 4*6 + 14*21 / 3*5 + 6*10 + 21*35

c) 3*13 - 13*18 / 15*40 - 80

d) (-5)^3*40*4^3 / 135 * (-2)^14 * (-100)^0

e)18*34+(-18)*124 / -36 *17 +9*(-52)

Answer 1

a: \(=\dfrac{54-34}{189-119}=\dfrac{20}{70}=\dfrac{2}{7}\)

b: \(=\dfrac{6+6\cdot4+6\cdot49}{15+15\cdot4+15\cdot49}=\dfrac{6}{15}=\dfrac{2}{5}\)

c: \(=\dfrac{13\left(3-18\right)}{40\left(15-2\right)}=\dfrac{-15}{40}=-\dfrac{3}{8}\)