21.6﹣0.8×4÷0.8×4．
画一画．（1）=（2）÷4=
直接写出得数．×= 1÷= ÷60%= ×15=﹣= 4.5+= ×= 6.8÷10%=
3克盐放入40克水中，盐占水的几分之几？水占盐水的几分之几？
直接写得数1÷= ÷10= ××=×= ÷= 6×=
直接写出得数= = = 3×== = = =8×= =
=
÷4=
×
= 1÷
= 
÷60%= 
﹣
×
= 6.8÷10%=
= 
÷10= 
×
×
=
×
= 
÷
= 6×
=
= 
= 
= 3×
=
= 
= 
= 
=
= 
=
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