直接写得数．
×
= 
÷2= ×
= 68÷10%=
×72% 
×
÷
= 
﹣
+
= 1﹣
﹣
=
80%﹣20%= 4×25%+16×25%= 
×
÷
×
= （
+
）×12=
直接写得数．×= ÷2= ×= 68÷10%=×72% ×÷= ﹣+= 1﹣﹣=
80%﹣20%= 4×25%+16×25%= ×÷×= （+）×12=
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