3)Tính nhanh (nếu có):
e)1/100-1/100.99-1/99.98-...-1/3.2-1/2.1
g)-15,5.20,8 + 3,5.9,2 - 15,5.9,2 + 3,5.20,8
3)Tính nhanh (nếu có):
e)1/100 - 1/100.99 - 1/99.98 - ... - 1/3.2 - 1/2.1
g) -15,5 . 20,8 + 3,5.9,2 - 15,5.9,2 + 3,5.20,8
15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8=
tính : a, 1/30 +1/42 +1/56 +1/17 +1/90 +1/110+1/132 . b, -15,5.20,8+3,5.9,2-15,5.9,3+3,5.20,8
tính nhanh: 1/100-1/100.99-1/99.98-.....1/3.2-1/2.1
Tính nhanh:
A= 1/100 - 1/100.99 - 1/99.98 - 1/98.97 - ... - 1/3.2 -1/2.1
D=1/100 - 1/100.99 - 1/99.98 -...-1/3.2 -1/2.1
C = 1/100 - 1/100.99 - 1/99.98 - 1/98.97 - .... - 1/3.2 - 1/2.1
1/100-1/100.99-1/99.98-...-1/3.2-1/2.1