小麦的出粉率一定，小麦的总重量和面粉的重量成正比例关系． ．
×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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