$$$120040 - \frac{6002 x}{5}$$$の積分

$$$\int \left(120040 - \frac{6002 x}{5}\right)\, dx$$$ を求めよ。

項別に積分せよ:

$${\color{red}{\int{\left(120040 - \frac{6002 x}{5}\right)d x}}} = {\color{red}{\left(\int{120040 d x} - \int{\frac{6002 x}{5} d x}\right)}}$$

$$$c=120040$$$ に対して定数則 $$$\int c\, dx = c x$$$ を適用する:

$$- \int{\frac{6002 x}{5} d x} + {\color{red}{\int{120040 d x}}} = - \int{\frac{6002 x}{5} d x} + {\color{red}{\left(120040 x\right)}}$$

定数倍の法則 $$$\int c f{\left(x \right)}\, dx = c \int f{\left(x \right)}\, dx$$$ を、$$$c=\frac{6002}{5}$$$ と $$$f{\left(x \right)} = x$$$ に対して適用する:

$$120040 x - {\color{red}{\int{\frac{6002 x}{5} d x}}} = 120040 x - {\color{red}{\left(\frac{6002 \int{x d x}}{5}\right)}}$$

$$$n=1$$$ を用いて、べき乗の法則 $$$\int x^{n}\, dx = \frac{x^{n + 1}}{n + 1}$$$ $$$\left(n \neq -1 \right)$$$ を適用します:

$$120040 x - \frac{6002 {\color{red}{\int{x d x}}}}{5}=120040 x - \frac{6002 {\color{red}{\frac{x^{1 + 1}}{1 + 1}}}}{5}=120040 x - \frac{6002 {\color{red}{\left(\frac{x^{2}}{2}\right)}}}{5}$$

したがって、

$$\int{\left(120040 - \frac{6002 x}{5}\right)d x} = - \frac{3001 x^{2}}{5} + 120040 x$$

簡単化せよ:

$$\int{\left(120040 - \frac{6002 x}{5}\right)d x} = \frac{3001 x \left(200 - x\right)}{5}$$

積分定数を加える:

$$\int{\left(120040 - \frac{6002 x}{5}\right)d x} = \frac{3001 x \left(200 - x\right)}{5}+C$$

$$$\int \left(120040 - \frac{6002 x}{5}\right)\, dx = \frac{3001 x \left(200 - x\right)}{5} + C$$$A