Toán lớp 12 - Đề kiểm tra 45 phút - Toán lớp 12 - Tháng 12 - Số 2
Câu 1
Chọn đáp án đúng nhất
Tính $I=\int\limits_{0}^{1}{{{\text{e}}^{3x}}.\text{d}x}$
$I={{\text{e}}^{3}}-1$
$I=\text{e}-1$
$\frac{{{\text{e}}^{3}}-1}{3}$
$I={{\text{e}}^{3}}+\frac{1}{2}$
Hướng dẫn giải (chi tiết)
$F(x)=\int{{{e}^{3x}}}dx=\frac{1}{3}{{e}^{3x}}+C$
$ I=F(1)-F(0)=\frac{{{e}^{3}}-1}{3}$
báo lỗi
Câu 2
Chọn đáp án đúng nhất
Họ nguyên hàm của hàm số $f\left( x \right)=2x+\sin 2x$ là
${{x}^{2}}+2\cos 2x+C$
${{x}^{2}}+\frac{1}{2}\cos 2x+C$
${{x}^{2}}-\frac{1}{2}\cos 2x+C$
${{x}^{2}}-2\cos 2x+C$
Hướng dẫn giải (chi tiết)
$\int{\left( 2x+\sin 2x \right)}dx=\int{2xdx+}\int{\sin 2xdx}$
$ =\frac{2{{x}^{2}}}{2}-\frac{1}{2}\cos 2x+C={{x}^{2}}-\frac{1}{2}\cos 2x+C$
báo lỗi
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