C

2010013803

Level: 
C
Any positive real number \(x\) can be written as \(x=c+d\), where \(c\) is an integer and \(d\in[ \left. 0,1\right)\). Then \(c\) is called the integer part of \(x\) and is denoted by \(\left[x\right]\). Evaluate the following definite integral. \[\int\limits_{\frac52}^{2.8}\left[x\right]\,\mathrm{d}x \]
\(0.6\)
\(0.9\)
\(2\)
This integral cannot be evaluated.

2000018406

Level: 
C
Which matrix from \(A\), \(B\), \(C\) and \(D\) does not have a determinant equal to zero? \[\] $A=\left( \array{ 1 & 2& 5\cr 1 & 3& 6\cr 1 & 4 & 7\cr } \right),$ $B=\left( \array{ 1 & 2& 3\cr 0 & 1& -1\cr 2 & 4 & 6\cr } \right),$ $C=\left( \array{ 1 & 1& 1\cr 2 & 3& 4\cr 15 & 16 & 17\cr } \right),$ $D=\left( \array{ 1 & 2& 5\cr 1 & -4& -6\cr 1 & -4 & 7\cr } \right)$
\(D\)
\(A\)
\(B\)
\( C\)