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Ответ:

а)|-21|÷|3|+5×|-2,2|

21÷3+5×2,2

7+11=18

б)

[tex] | - 12 \frac{8}{9} | \div |3 \frac{2}{18} | + |3 \frac{5}{18} |[/tex]

[tex] \frac{116}{9} \div \frac{56}{18} + \frac{59}{18} [/tex]

[tex]29 \times \frac{2}{14} + \frac{59}{18} [/tex]

[tex] \frac{29}{14} + \frac{59}{18} [/tex]

[tex] \frac{935}{126} [/tex]