2.3×0.3= 0.42×0.2= 3.5×0.2=12×0.2= 1.8×0.5= 0.9×0.11=1.22×0.4= 0.12×0.6= 0.02×500=
直接写出得数．578+216= 18.25﹣3.3= 3.2﹣=×8.1= += ÷3=0.99×9+0.99= ×=
口算．530﹣399= 9.6÷0.6= ÷6= 25+75÷25+75=0.5= = = ×9=
直接写出得数：142﹣69= 0.56÷8= 1.2×=5.4+9= 0.6×0.6= 7÷0.8=5.1÷0.01= 1÷175%= 3﹣﹣=×5×7=
直接写出得数3500﹣800= 0.4×0.2= 19﹣0.9=8÷= 204÷12= +=+= 0.9+99×0.9=
直接写得数．46+315= 12.8﹣7.6= 25×28= 3.14÷0.1=0.24×= += ÷= ﹣0.25=×= 1÷= ÷= 80×40%=
=
×8.1= 
= 
÷3=
=
÷6= 25+75÷25+75=
= 
= 
= 
×9=
=
÷0.8=
÷175%= 3
﹣
=
×5×7=
= 204÷12= 
+
=
+
= 0.9+99×0.9=
= 
+
= 
÷
﹣0.25=
×
= 1÷
÷
= 80×40%=
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