Tính;
\(\frac{2.6.12+6.12.20+12.21.32}{3.8.15+9.16.25+18.28.40}\)
Rút gọn :
\(\frac{2.6.12+6.12.20+12.21.32}{3.8.15+9.16.25+18.28.40}\)
Rút gọn
A=2.6.12+6.12.20+12.21.31/3.8.15+9.6.25+18.28.40
2.6.12+6.12.30+12.21.32
3.8.15+9.16.25+18.28.40
1. Tính nhanh
\(\frac{1.5.6+2.10.12+4.20.24+9.45.54}{1.3.5+2.6.12+4.12.20+9.27.45}\)
2.17.12+2.6.12+8.3.62=
rút gọn rồi quy đồng mẫu số
1.2.3+2.4.6+3.6.9+5.10.15/1.3.6+2.6.12+3.9.18+5.15.30
Rút gọn rồi quy đồng mẫu 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
Thực hiện phép tính:
a, A=1/2+1/14+1/35+1/65+1/104+1/152+1/209
b, 1010/1008.8-994-1.2.3+2.4.6+3.6.9+5.10.15/1.3.6+2.6.12+3.9.18+5.10.30
c, 1/1.2.3+1/2.3.4+1/3.4.5+...+1/10.11.12
