×5.4= ×16= 12÷ = × =
0× + = × = 1÷ = ÷ =
÷ = × ÷ × =
÷ × ÷ × ÷
如果一个小正方形的对角线长10cm,则点(0,0)东偏北45°方向20m处是点;点(5,3)南偏西45°方向30m处是点。