 ﹣ = |  + = |  ×12= |
 ÷ = |  ÷20%= | 4.8+2%= |
+
=
﹣
=
×
=
=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×= | ÷= |
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