问题195: 计算{−4^2−[15.2−(−24+9)×0.6]}×(−12)+7.9

$$ \begin{aligned} & \left\{-4^2-[15.2-(-24+9) \times 0.6]\right\} \times\left(-\frac{1}{2}\right)+7.9 \\ = & \{-16-[15.2+15 \times 0.6]\} \times\left(-\frac{1}{2}\right)+7.9 \\ = & \{-16-[15.2+9]\} \times\left(-\frac{1}{2}\right)+7.9 \\ = & \{-16-24.2\} \times\left(-\frac{1}{2}\right)+7.9 \\ = & 40.2 \times \frac{1}{2}+7.9 \\ = & 20.1+7.9 \\ = & 28 \end{aligned} $$

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