78乘39的积比它们的和多多少？
直接写得数30﹣19.02= 1﹣0.94+0.06= 3.125+1= 1×5÷×=1÷0.1﹣1×0.1= 12×3.14﹣6.28= ++= ×0.25+3=
直接写得数4.3+3.57= 6.3÷0.9= 2.4×0.5= 1÷0.2÷0.5=5﹣﹣= 10÷10%= 1÷0.2÷0.5= 7×÷7×=
直接写得数24÷= ﹣= 10+2.52= （﹣0.5）×=×= （+）×12= ×÷×= 0.32×200=
计算下面各题．= = = =+= = = ==
口算：= = = = == = =
= 1×5÷
×=
++
= 
×0.25+3== 1×5÷×=++= ×0.25+3=
﹣
= 10÷10%= 1÷0.2÷0.5= 7×
÷7×
= 
﹣
= 10+2.52= （
=
×
= （
+
）×12= 
÷
×
= 
= 
= 
=
+
= 
= 
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