Question

rút gọn rồi quy đồng mẫu số các phân số sau:

C=1010/1008.8-994 ; D=1.2.3+2.4.6+3.6.9+5.10.15/1.3.6+2.6.12+3.9.18+5.15.30

 

Answer 1

C = \(\dfrac{1010}{1008\times8-994}\)

C = \(\dfrac{1010}{8064-994}\)

C = \(\dfrac{1010}{7070}\)

C = \(\dfrac{1}{7}\)

Answer 2

D = \(\dfrac{1.2.3+2.4.6+3.6.9+5.10.15}{1.3.6+2.6.12+3.9.18+5.15.30}\)

D = \(\dfrac{6+8.6+6.27+6.125}{18+18.8+18.27+18.125}\)

D = \(\dfrac{6.\left(1+8+27+125\right)}{18.\left(1+8+27+125\right)}\)

D = \(\dfrac{1}{3}\)

Answer 3

C = \(\dfrac{1}{7}\) = \(\dfrac{3}{21}\)

D = \(\dfrac{1}{3}\) = \(\dfrac{7}{21}\)