用竖式计算.165×46= 218×73= 307×92=750×24= 280×50= 408×40=
3÷ ==0.75=6: = %
3÷ ==0.6=6: = %.
3:5==9: == .
=0.375=12÷ = %=0.45= %= ÷ .
= ÷ = = % ÷ =0.25== %