7.
如图,要用“SAS”证△ABC≌△ADE,若已知AB=AD,AC=AE,则需要条件是( )
| A. | ∠1=∠2 | B. | ∠E=∠C | C. | ∠BAD=∠CAE | D. | ∠B=∠D |
6.用公式法解方程$\sqrt{2}$x2+4$\sqrt{3}$x=2$\sqrt{2}$,其中求得b2-4ac的值是( )
| A. | 16 | B. | ±4 | C. | 32 | D. | 64 |
3.下列关于有理数的说法中,错误的是( )
0 286684 286692 286698 286702 286708 286710 286714 286720 286722 286728 286734 286738 286740 286744 286750 286752 286758 286762 286764 286768 286770 286774 286776 286778 286779 286780 286782 286783 286784 286786 286788 286792 286794 286798 286800 286804 286810 286812 286818 286822 286824 286828 286834 286840 286842 286848 286852 286854 286860 286864 286870 286878 366461
| A. | 所有的整数都是有理数 | B. | 所有的分数都是有理数 | ||
| C. | 所有的无限小数都是有理数 | D. | 所有的有限小数都是有理数 |