饭店给5个客人准备饭菜所需时间分别为6、10、12、15、20分钟，有两个厨师分别打理，怎样安排才能使等候的时间最短？
直接写得数．×0×17= ÷4÷= ÷= 57×= ﹣+=××= 1÷= （6+）×= ﹣= +=
4÷= ×6÷= 6×+6×= ×=（+）×16= 1÷= ×= 24%×5=
口算：（1）÷= 4﹣= 0÷（1+）=（2）﹣= 1.75+= ××12=（3）2×= ÷= 2×（+）= ×÷×=
直接写出得数．= = = 6.3×10%== 7×= = 40%﹣0.25=
直接写出得数．1÷= +÷4= ×÷×= 3÷﹣÷3=÷0.8%= 0.705+3.35= 1.5×（﹣）= 0.375×0.375=
×0×17= 
÷4÷
÷
= 57×
= 
﹣
+
=
×
×
= 1÷
= （6+
）×
= 
﹣
= 
+
=
= 
×6÷
+6×
= 
×
=
+
）×16= 1÷
= 
×
= 24%×5=
÷
= 4﹣
= 0÷（1+
）=
= 1.75+
= 
×
×12=
= 
÷
= 2×（
+
）= 
×
÷
= 
= 
= 6.3×10%=
= 7×
= 
= 40%﹣0.25=
= 
+
÷4= 
×
÷
×
= 3÷
﹣
÷0.8%= 0.705+3.35= 1.5×（
）= 0.375×0.375=
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