，乙植树的棵数是其余三人的
，丙植树的棵数是其余三人的
，丁植树
×12= （4）2.5－1.7= （7）
÷3=
－
= 
＋
= 
÷
= 
×
= 
87.5%×
=
×÷ = 
﹣2 
+3.24×6 
．  +  = |  ﹣  = |  ÷  = | 1÷  = |
17×  = |  ﹣  = | 3﹣4× = | 1﹣  ﹣  = |
28×（  + ）= | 1  ×  = | ||
m的是
是20t．  ÷5=________ | 3÷  =________ | 3×  +0=________ | （1﹣  ）×14=________ |
 ×  =________ |  ×3.6=________ |  ÷  =________ | 5﹣  ×  =________ |
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