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$1) - 13.6 \times ( - 7.2 + 313.2 \div 8.7) = - 391.68 \\ 1)313.2 \div 8.7 = 36 \\ 2) - 7.2 + 36 = 28.8 \\ 3) - 13.6 \times 28.8 = - 391.68 \\ \\ \\ 2) - 16.3 \times ( - 8.3 + 212.8 \div 7.6) = - 321.11 \\ 1)212.8 \div 7.6 = 28 \\ 2) - 8.3 + 28 = 19.7 \\ 3) - 16.3 \times 19.7 = - 321.11 \\ \\ \\ 3) - 9.396 \div 27 - 0.2 \times 1.7 = - 0.688 \\ 1) - 9.396 \div 27 = - 0.348 \\ 2)0.2 \times 1.7 = 0.34 \\ 3) - 0.348 - 0.34 = - 0.688$

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