（1）油菜籽的出油率是42%，2100千克油菜籽可榨油多少千克？（2）油菜籽的出油率是42%，一个榨油厂榨出菜油2100千克，用油菜籽多少千克？
直接写出得数×=×=÷3= 16×=+=×÷=×÷×= 1÷3×=÷= 5÷﹣5÷=
直接写得数 14×=×=÷4=×=×7+=×3÷×3=
×÷10÷×14×÷÷÷×3．
3×=，+=，﹣=，÷= 1÷=，×6=，×=，1÷10%= ÷4=，×12×= ．
直接写出得数．×=÷= 1.25×8= 1﹣+=+= 75×10%=÷3﹣= 9﹣0.9=
×
=
×
=
÷3= 16×
=
+
=
×
÷
=
×
÷
÷
= 5÷
﹣5÷
=
×
=
÷4=
×
=
×7+
×3÷
×
÷10
÷
×14×
÷
÷
÷
×3．
=，
+
=，
﹣
=，
÷
= 
=，
×6=，
×
=，1÷10%= 
÷4=，
×12×
= ．
×
=
÷
= 1.25×8= 1﹣
+
=
+
= 75×10%=
= 9﹣0.9=
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