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a) = 2,4 -0,8 =1,6
b) = [tex]\frac{216-21}{90} - \frac{106-10}{90} = \frac{195}{90} - \frac{96}{90} = \frac{99}{90} =\frac{11}{10} =1\frac{1}{10}[/tex]
c) = 5.94
d) = [tex]2\frac{24}{100} - \frac{13-1}{9} = \frac{224}{100} - \frac{4}{3} =\frac{672-400}{300} = \frac{68}{75} sau 0.90(6)[/tex]