5 单选(4分)下列不等式不成立的是 () .-|||-○A. (int )_(0)^pi (e)^-(x^2)(cos )^2xdxgt (int )_(pi )^2pi (e)^-(x^2)(cos )^2xdx-|||-○ B. (int )_(2)^3(x)^2dxlt (int )_(2)^3(x)^3dx-|||-o C. (int )_(0)^1(e)^-(x^2)dxlt (int )_(0)^1(e)^-xdx-|||-D D. (int )_(0)^1xdxgt (int )_(0)^1ln (1+x)dx

设向量组α，β，γ及数ｋ，ｌ，ｍ满足：ｋα＋ｌβ＋ｍγ＝０，且ｋｍ≠０，则（）。A. α，β与α，γ等价B. α，β与β，γ等价C. α，γ与β，γ等价D. α与γ等价

178 设f(x)一阶可导, (x)gt 0, '(x)gt 0, 则当 Delta xgt 0 时-|||-(A) (int )_(x)^x+dxf(t)dtgt f(x)Delta xgt 0. (B) (int )_(x)^x+Delta xf(t)dtlt f(x)Delta xlt 0.-|||-(C) (x)Delta xgt (int )_(x)^x+Delta xf(t)dtgt 0. (D) (x)Delta xlt (int )_(x)^x+Delta xf(t)dtlt 0.

设A是 times 4 矩阵、且A的列向量组线性无关,则下列错误的是 ()-|||-A 对于任意列向量b,线性方程组 ^Tx=b 必有无穷多解-|||-B 对于任意列向量b,线性方程组 Ax=b 必有唯一解-|||-C 齐次线性方程组 ^Tx=overrightarrow (0) 只有零解-|||-D 齐次线性方程组 =overrightarrow (0) 必有非零解

16PF的答题形式属于（  ）。A. 是非式B. 折中是非式C. 文字等级式D. 数字等级式

下列式子或叙述不正确的是A.(int )_(0)^dfrac (pi {4)}(tan )^2xdx=1-dfrac (pi )(4) __-|||-__B.设函数 (int )_(0)^dfrac (pi {4)}(tan )^2xdx=1-dfrac (pi )(4) __-|||-__ 在 x = 0 点连续则 a = 1 3 C.(int )_(0)^dfrac (pi {4)}(tan )^2xdx=1-dfrac (pi )(4) __-|||-__D. (int )_(0)^dfrac (pi {4)}(tan )^2xdx=1-dfrac (pi )(4) __-|||-__

3、单选-|||-对定积分定义, (int )_(a)^bf(x)dx=lim _(lambda arrow 0)sum _(i=1)^nf((xi )_(i))Delta (x)_(i), 下列关于分割方式-|||-与ξ1的选取方法的说法中正确的是 () .-|||-(4分)-|||-A [a,b]必须进行n等分, _(i)in [ (x)_(i-1),(x)_(i)] 可以任意取-|||-B [a,b]可以任意分割,且ξ1可以在 [ (x)_(i)-1,(x)_(i)] 内任意选取-|||-C [a,b]必须进行n等分,ξ1要取作 [ (x)_(i)-1,(x)_(i)] 的中点-|||-D [a,b]可以任意分割,ξ1只能选取 [ (x)_(i)-1,(x)_(i)] 的端点

4. 最α, β∈R^n, 则长 (|alpha ,alpha |)^(pi _{1)}^(pi _{1)}^(k_{1)}^theta (alpha ,beta )| . 的值 ()-|||-(A) geqslant 0 (B) =0 (C) leqslant 0 (D)不确

3、单选(4分) 利用估值性,下列不等式不成立的是-|||-()-|||-A https:/img.zuoyebang.cc/zyb_a0d29ecb7587d7b6dac205a2602449e6.jpgleqslant (int )_(0)^1(e)^(x^2)dxleqslant e-|||-B https:/img.zuoyebang.cc/zyb_a0d29ecb7587d7b6dac205a2602449e6.jpgleqslant (int )_(1)^3dfrac (1)(1+{x)^3}dxleqslant dfrac (5)(3)-|||-C " pi leqslant (int )_(0)^pi dfrac (1)(sqrt {1-dfrac {1)(2)(sin )^2x}}dxleqslant sqrt (2)pi -|||-D dfrac (1)(2)leqslant (int )_(1)^4dfrac (1)(2+x)dxleqslant 1

3、单选-|||-对定积分定义, (int )_(a)^bf(x)dx=lim _(lambda arrow 0)sum _(i=1)^nf((xi )_(i))Delta (x)_(i), ,下列关于分割方式-|||-与ξ的选取方法的说法中正确的是 () .-|||-(4分)-|||-A [a,b]必须进行n等分, _(i)in [ (x)_(i)-1,(x)_(i)] 可以任意取-|||-B [a,b]可以任意分割,且ξ1可以在 [ (x)_(i)-((x))_(i)(y)_(i)((x)_(i)) 内任意选取-|||-C [a,b]必须进行n等分,ξi要取作 [ (x)_(i)-((x))_(i)(y)_(i)((-{x)_(i))}^-1(({x)_(i))} 的中点-|||-D [a,b]可以任意分割,ξ1只能选取 [ (x)_(i)-((x))_(i)(y)_(i)((-{x)_(i))}^-1(({x)_(i))} 的端点