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511.

▪1)

$- 9.25 + ( - 3 \frac{1}{5} ) = - 9.25 - 3.2 = - 12.45$
▪2)

$- 72 + 3 \frac{5}{8} + ( - 0.75) = - 72.75 + 3 \frac{5}{8} = - 72 \frac{3}{4} + 3 \frac{5}{8} = - 72 \frac{6}{8} + 3 \frac{5}{8} = - 69 \frac{1}{8}$
▪3)

$15 + ( - 9.46) + ( - \frac{23}{50} ) = 15 - 9 \frac{23}{50} - \frac{23}{50} = 15 - 9 \frac{46}{50} = 6 - \frac{46}{50} = 5 \frac{4}{50} = 5.08$
▪4)

$- 83.4 + ( - 19 \frac{2}{3} ) + ( - \frac{4}{15} ) = - 83\frac{2}{5} - 19 \frac{10}{15} - \frac{4}{15} = - 83 \frac{6}{15} - 19 \frac{14}{15} = - 102 \frac{20}{15} = - 102 \frac{4}{3} = - 103 \frac{1}{3}$
512.

▪1)

$- 2.6 + ( - 0.3) + ( - 1.4) + ( - 9.7) = (- 2.6 - 1.4) + ( - 0.3 - 9.7) = - 4 - 10 = - 14$
▪2)

$1.5 - 5.4 + ( - 1.6) + 8.5 = (1.5 + 8.5) + ( - 5.4 - 1.6) = 10 - 7 = 3$
▪3)

$4.37 + ( - 3.65) + ( - 7.35) + 6.63 = (4.37 + 6.63) + ( - 3.65 - 7.35) = 11 - 11 = 0$
▪4)
$0.13 + ( - 9.94) + ( - 2.13) + ( - 0.06) = (0.13 - 2.13) + ( - 9.94 - 0.06) = - 2 - 10 = - 12$