3只小蚂蚁分别沿着下面图形的边线爬一周．
（1）请你用彩色笔指出3个图形各自的边线．
（2）估一估，图 的周长最长．
直接写出得数．
3.8﹣2.9= 960÷80= 2.4+1.6=（
+
）×4=
1.5×
= 24÷
=
÷
=
×
=
直接写数对又快．
2.3+3.57= 8×12.5%= 5.7+11.8+4.3= 1÷100%=
0.99×9+0.99= 40÷9= 12×（
×
）=
×
=
﹣0.5=
×25%=
直接写得数．
0.67+4.5= 1+2%=
=
=
=
=
= 0.32÷4=
2.2+8= 5÷
×
= 0.25××4= 15+5÷0.2=
4.38﹣3.42+5.62﹣2.08= 125÷
= 1÷25%= 0×
=
2﹣
= 32×1.25×2.5=
直接写出得数．
9.9+0.9= 0.36÷0.6= 10﹣1.25= 0.5×1.2=
÷8=
×39=
÷0.25= 0×
÷
=
×
÷×
=（
+
）×6=