+
=
﹣
=
×
=
=0.4= %=2： ． 
=6： = % | 3.3+2.58= | 64÷ = | 0÷ = | 2﹣0.55= | 1+36%= |
 ×80%= | 5.2÷0.02= | 0.85﹣70%= |  + = | 1﹣﹣ = |
 ×7.5%÷×7.5%= | 99×65+65= | 31.4×15×= | ÷= |
| 571﹣402= |  ﹣ = | 3.04﹣1.4= | 18÷6%= | × ÷ ×= |
 ÷25%= |  + ÷2= |  ÷= | 1﹣0.01= | 0.18÷0.15×0= |
÷3= 
×15= 2-
= 1＋2%= 
÷
= 5÷
= 
×75% = ×4×
=
＋
×
= 
×99＋99×= 
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