+ + + =
×15=" 0.324÷0.01=" 4÷ 
= 
×1 
=÷3=" 3.2x﹣1.9x=" 2a+1.5a= 24×4%=﹣ 
）×18= 
= 
÷80%=
+ 
=  ﹣ = |  +  = | 6× = | 2- = |
 × = |  × = |  × = |  +  +  = |
| ÷5= | +  = |  ×  = | 5÷ = |
 ÷ = | 4÷  = | ﹣= | 0÷ = |
是
是米，4条这样的绳子长长是多少，用乘法算式表示是
÷120.5%． 
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