如图,AD是△ABC的角平分线,DE⊥AB于点E,S△ABC=8,ED=2,AC=3,则AB的长是( )
A:5
B:6
C:7
D:8
34 ×2.8=
0.75+ 14 =
37 × 13 =
910 ÷ 35 =
12 ÷60%=
34 ﹣ 34 × 16 =
120× 720 =
18× 35 × 59 =
抛物线y=2x2上两点A(x1,y1)、B(x2,y2)关于直线y=x+m对称,且x1·x2=-12,则m等于( )