+
=
3.5+6
=
2﹣
= 
﹣
= 
﹣
= 
﹣
=
0.2﹣
=
0.3+
= 
×4= 
×
= 
×
15×1
= 
×
=
0÷
=
24÷= 
÷
= 
÷1
= 
÷
= 
÷=
9+
=
12π=
0.4×3.14=
0.92=
2.5×3.4=
28÷
= ．
+=
3.5+6=
2﹣= ﹣= ﹣= ﹣=
0.2﹣=
0.3+= ×4= ×= ×
15×1= ×=
0÷=
24÷= ÷= ÷1= ÷= ÷=
9+=
12π=
0.4×3.14=
0.92=
2.5×3.4=
28÷= ．
，那么甲、乙两数成正比例． ．（判断对错）
，那么a和b成 比例．
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