Bài 1: Thực hiện phép tính bằng cách hợp lý (nếu có thể):
1/ 3/4 + 5/4 . 2\(\dfrac{2}{3}\) - (-1/2)2 : 6/5
2/ 7\(\dfrac{23}{27}\) + 11/25 + 3,25 - 23/27 + 14/25
3/ (1/9)2005 . 92005 - 962 : 242
4/ 2.(-3/2)2 - 7/2
5/ 7.5 : (-5/3) + 2\(\dfrac{1}{2}\) : (-5/3)
6/ (3/5 + 1/2)2
7/ 0,5.(-3\(\dfrac{1}{2}\))
8/ (3\(\dfrac{4}{5}\) + 0,2)(3/14 : 6/7 -2/7)
9/ 10.(-1/2)3 + 1/4
10/ 16\(\dfrac{2}{7}\) : (-3/5) - 28\(\dfrac{2}{7}\) : (-3/5)
11/ (3\(\dfrac{1}{3}\) .1,9 +19,5 : 4\(\dfrac{1}{3}\) )(62/75 - 4/25)