下列等式与不等式中,不成立的是( )
A: (-2)10=-210
B: (-1)2n+2=1(n为正整数)
C: (-2)2>(-2)7
D: -43<-34
A: (-2)10=-210
B: (-1)2n+2=1(n为正整数)
C: (-2)2>(-2)7
D: -43<-34
举一反三
- 下列多项式在有理数域上不可约的是( )。 A: $(x-a_{1})(x-a_{2})...(x-a_{n})-1$,其中$a_{1},a_{2},...,a_{n}$是两两互异的整数; B: $(x-a_{1})(x-a_{2})...(x-a_{n})+1$,其中$a_{1},a_{2},...,a_{n}$是两两互异的整数; C: $(x-a_{1})^{2}(x-a_{2})^{2}...(x-a_{n})^{2}+1$,其中$a_{1},a_{2},...,a_{n}$是两两互异的整数; D: $(x-a_{1})^{2}(x-a_{2})^{2}...(x-a_{n})^{2}-1$,其中$a_{1},a_{2},...,a_{n}$是两两互异的整数.
- 下列选项中不能用来判断一个整数n是偶数的是() A: n%2==0 B: n%2!=1 C: n/2==n//2 D: n/2!=n//2
- 设`\n`阶方阵`\A`满足`\|A| = 2`,则`\|A^TA| = ,|A^{ - 1}| = ,| A^ ** | = ,| (A^ ** )^ ** | = ,|(A^ ** )^{ - 1} + A| = ,| A^{ - 1}(A^ ** + A^{ - 1})A| = `分别等于( ) A: \[4,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] B: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n + 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] C: \[4,\frac{1}{2},{2^{n + 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\] D: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\]
- 判断整数n是否为奇数的条件表达式有()。 A: n-n/2*2 B: n%2==1 C: n & 1 D: (n & 1)==1
- 设A为n阶可逆矩阵,则下列等式中,不一定成立的是 ( ) A: (A+A-1)2=A2+2AA-1+(A-1)2 B: (A+AT)2=A2+2AAT+(AT)2 C: (A+A*)2=A2+2AA*+(A*)2 D: (A+E)2=A2+2A+E