Tích phân $\int_{-1}^{2} 2 x \mathrm{~d} x$ bằng

A. $3$ B. $6$ C. $-3$ D. $-6$ Ta có: $\int_{-1}^{2} 2 x \mathrm{~d} x=\left.x^{2}\right|_{-1} ^{2}=4-1=3$Chọn A

Question

Accepted Answer

A.

$3$

B.

$6$

C.

$-3$

D.

$-6$

Ta có: $\int_{-1}^{2} 2 x \mathrm{~d} x=\left.x^{2}\right|_{-1} ^{2}=4-1=3$

Chọn A