1. Thực hiện phép tính theo cách hợp lí nhất
a)(\(\dfrac{3}{5}+0,415-\dfrac{3}{200}\)).\(2\dfrac{2}{3}.0,25\)
b)0,25:(10,3-9,8)-\(\dfrac{3}{4}\)
c)\(\left(\dfrac{7}{8}-\dfrac{3}{4}\right).1\dfrac{1}{3}-\dfrac{2}{7}\)(3.5)2
d)\(1\dfrac{13}{15}.0,75-\left(\dfrac{11}{20}+25\%\right).\dfrac{10}{11}\)