这两路公共汽车同时发车以后，至少过多少分钟两路车才第二次同时发车？
×4= ．
+++= × = = × = ．
直接写得数．×40= = == = 18×8×= ×0×= =
直接写得数．×0= ×= ×12= ×= 45×=9×= ×= ×100= 18×= ×=+= 18×= ×= 1×= ﹣=×21= ×= ×6= × ×9=×= 2﹣=
一瓶果汁重千克，20瓶果汁重多少千克？
×4=
．
+
+
= × = ．
×40= 
= 
=
= 
= 18×
= 
×0×
= 
=
×0= 
×
= 
×12= 
×
= 45×
=
= 
×
= 
×100= 18×
= 
×
=
+
= 18×
= 
×
= 
﹣
=
×21= 
×
= 
×6= 
×
×9=
×
= 2﹣
=
千克，20瓶果汁重多少千克？
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