直接写出得数．
+
= 
﹣
= 
×
= 
÷=
×
= 
﹣0.8= 
+
= 
÷4=
3.5﹣2.9= 36.4÷100= 1.7×0.3= 4.8+2=
×21= 9.82﹣0.2= 0.8÷0.002= 2.5×1.7×4=
直接写出得数．+= ﹣= ×= ÷=×= ﹣0.8= += ÷4=
3.5﹣2.9= 36.4÷100= 1.7×0.3= 4.8+2=×21= 9.82﹣0.2= 0.8÷0.002= 2.5×1.7×4=
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