Question

Rút gọn phân số:

a/ 25.13/26.35

b/ 6.9 - 2.17/63.3 - 119

c/ 3.13 - 13.18/15.40 - 80

d/ 2929 - 101/2.1919 + 404

f/ -1997.1996+1/(-1995).(-1997)+1996

g/ 2.3+4.6+14.21/ 3.5+6.10+21.35

h/ 3.7.13.37.39 - 10101/ 505050 - 70707

/ dấu phân số

Answer 1

a, \(\dfrac{25.13}{26.35}=\dfrac{5.1}{2.7}=\dfrac{5}{14}.\)

b, \(\dfrac{6.9-2.17}{63.3-119}=\dfrac{2.3.9-2.17}{9.7.3-17.7}=\dfrac{2\left(3.9-17\right)}{7\left(9.3-17\right)}=\dfrac{2}{7}.\)

c, \(\dfrac{3.13-13.18}{15.40-80}=\dfrac{13\left(3-18\right)}{15.40-40.2}=\dfrac{13.\left(-15\right)}{40\left(15-2\right)}=\dfrac{13.\left(-15\right)}{40.13}=\dfrac{-15}{40}=\dfrac{-3}{8}.\)d, \(\dfrac{2929-101}{2.1919+404}=\dfrac{29.101-101.1}{2.19.101+101.4}=\dfrac{101\left(29-1\right)}{38.101+101.4}=\dfrac{101\left(29-1\right)}{101\left(38+4\right)}=\dfrac{29-1}{38+4}=\dfrac{28}{42}=\dfrac{2}{3}.\)

(còn tiếp!!!)

~ Chúc bn học tốt!!! ~