第二类曲线积分中常数的运算性质/线性(B017)

问题

已知 $\alpha$ 和 $\beta$ 为常数,则 $\int_{L}$ $\big[$ $\alpha$ $\boldsymbol{F}_{1}(x, y)$ $+$ $\beta$ $\boldsymbol{F}_{2}(x, y)$ $\big]$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $=$ $?$

选项

[A].   $\int_{L}$ $\big[$ $\alpha$ $\boldsymbol{F}_{1}(x, y)$ $+$ $\beta$ $\boldsymbol{F}_{2}(x, y)$ $\big]$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $=$ $\alpha$ $\int_{L}$ $\boldsymbol{F}_{1}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $+$ $\beta$ $\int_{L}$ $\boldsymbol{F}_{2}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$

[B].   $\int_{L}$ $\big[$ $\alpha$ $\boldsymbol{F}_{1}(x, y)$ $+$ $\beta$ $\boldsymbol{F}_{2}(x, y)$ $\big]$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $=$ $\frac{1}{\alpha}$ $\int_{L}$ $\boldsymbol{F}_{1}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $+$ $\frac{1}{\beta}$ $\int_{L}$ $\boldsymbol{F}_{2}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$

[C].   $\int_{L}$ $\big[$ $\alpha$ $\boldsymbol{F}_{1}(x, y)$ $+$ $\beta$ $\boldsymbol{F}_{2}(x, y)$ $\big]$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $=$ $\alpha$ $\int_{L}$ $\boldsymbol{F}_{1}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $\times$ $\beta$ $\int_{L}$ $\boldsymbol{F}_{2}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$

[D].   $\int_{L}$ $\big[$ $\alpha$ $\boldsymbol{F}_{1}(x, y)$ $+$ $\beta$ $\boldsymbol{F}_{2}(x, y)$ $\big]$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $=$ $\alpha$ $\int_{L}$ $\boldsymbol{F}_{1}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $-$ $\beta$ $\int_{L}$ $\boldsymbol{F}_{2}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$


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$\int_{L}$ $\big[$ $\alpha$ $\boldsymbol{F}_{1}(x, y)$ $+$ $\beta$ $\boldsymbol{F}_{2}(x, y)$ $\big]$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $=$ $\alpha$ $\int_{L}$ $\boldsymbol{F}_{1}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$ $+$ $\beta$ $\int_{L}$ $\boldsymbol{F}_{2}(x, y)$ $\cdot$ $\mathrm{d} \boldsymbol{r}$