10 3*10=30
1. ( )
2 x(x 3)4 ( )
Ax1 Bx4
Cx1 1x24 Dx11x2 4
3 y x22x1 yx x ( )
Ax<1 Bx>1
Cx<1 Dx> 1
4
4 2
x ( )
A(x2)2(x4)2x2
B(x4)2x2(x2)2
Cx2(x4)2(x2)2
D(x4)2(x2)2x2
5 RtABC C 90 RtDEC AD
B65 ADE ( )
A30B25C20D15
6 8 (
)
400 88 ( )
