在同一平面内,过直线外一点,能作 条直线与已知直线平行.
=2: =4÷ = %=0.2.
12÷ = :12=0.75= = %
0.75=6÷ = :12== %
1.75=7÷ ==28÷ =.
= ÷60=2:5= %= 填小数.