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7) $\frac{-2,25}{0,25} =- \frac{225*100}{100*25} =-9$
8) $\frac{-15,2}{9,5} =- \frac{152*10}{10*95} =- \frac{152}{95} =-1 \frac{57}{95} =-1 \frac{3}{5} = -1,6$
9) $\frac{-8,32}{-6,4} = \frac{832*10}{100*64} = \frac{13}{10} =1 \frac{3}{10} = 1,3$
10) $\frac{-4,6}{-9,2} = \frac{46*10}{10*92} = \frac{1}{2} = 0,5$
11) $\frac{-4,88}{6,1} =- \frac{488*10}{100*61} =- \frac{8}{10} = -0,8$
12) $\frac{1,68}{-5,6} =- \frac{168*10}{100*56} = \frac{3}{10} = -0,3$