a) (1intreg [tex] \frac{1}{3} [/tex] + [tex] \frac{5}{7} [/tex])+([tex] \frac{11}{3} [/tex]-[tex] \frac{12}{7} [/tex])=
([tex] \frac{5}{3} [/tex] + [tex] \frac{5}{7} [/tex]) + ([tex] \frac{11}{3} [/tex]-[tex] \frac{12}{7} [/tex])
([tex] \frac{35}{21} [/tex] + [tex] \frac{15}{21} [/tex]) + ( [tex] \frac{77}{21} [/tex]-[tex] \frac{36}{21} [/tex])
[tex] \frac{50}{21} [/tex] + [tex] \frac{41}{21} [/tex]=[tex] \frac{91}{21} [/tex]
b)(1+2√2) - (3√2) - 7 - (8-√2)
(1+8) - ( 18) -7-(8-2)
9-18-13=-22