11.若关于x的不等式组$\left\{\begin{array}{l}x-m<0\\ 3-2x≤1\end{array}\right.$的所有整数解的和是10,则m的取值范围是( )
| A. | 4<m<5 | B. | 4<m≤5 | C. | 4≤m<5 | D. | 4≤m≤5 |
10.分解因式2x2-4x+2的最终结果是( )
| A. | 2x(x-2) | B. | 2(x-1)2 | C. | 2(x2-2x+1) | D. | (2x-2)2 |
7.$\frac{1}{9}$的平方根是( )
0 306581 306589 306595 306599 306605 306607 306611 306617 306619 306625 306631 306635 306637 306641 306647 306649 306655 306659 306661 306665 306667 306671 306673 306675 306676 306677 306679 306680 306681 306683 306685 306689 306691 306695 306697 306701 306707 306709 306715 306719 306721 306725 306731 306737 306739 306745 306749 306751 306757 306761 306767 306775 366461
| A. | $\frac{1}{3}$ | B. | $±\frac{1}{3}$ | C. | $-\frac{1}{3}$ | D. | $±\frac{1}{81}$ |