解答 - 运算顺序

$$\left(2\cdot {10}^{-4}\right)\cdot \left(8.1\cdot {10}^{-1}\right)$$

$$\left(2\cdot {10}^{-4}\right)\cdot \left(8.1\cdot {10}^{-1}\right)$$

$$\left(2\cdot 0.0001\right)\cdot \left(8.1\cdot {10}^{-1}\right)$$

$$\left(2\cdot 0.0001\right)\cdot \left(8.1\cdot {10}^{-1}\right)$$

$$\left(0.0002\right)\cdot \left(8.1\cdot {10}^{-1}\right)$$

$$0.0002\cdot \left(8.1\cdot {10}^{-1}\right)$$

$$0.0002\cdot \left(8.1\cdot 0.1\right)$$

$$0.0002\cdot \left(8.1\cdot 0.1\right)$$

$$0.0002\cdot \left(0.81\right)$$

$$0.0002$$