[tex]6,25:0,4+7,65*20-1000*0,01*5^2=15.625+153-250= \\ =-81,375 \\ sau \\
6,25:0,4+7,65*20-1000*0,01*5^2= \frac{625}{100}: \frac{4}{10} +\frac{765}{100}*20- \\ -1000* \frac{1}{100}*25= \frac{625}{100}* \frac{10}{14}+153-250= \frac{625}{40}-97=- \frac{3255}{40}= \\ = -\frac{651}{8}= -81 \frac{3}{8}=- 81,375 [/tex]
