口算．
= 
= 
= 2.25+
=
= 2.5×0.1= 7.5÷0.5= 
=
20.1+9.09= 
×
= 
﹣
= 1÷0.1﹣1×0.1=
（
+
）×63= 0.5÷
= 0.4÷40%= 0.42﹣0.32=
口算．= = = 2.25+== 2.5×0.1= 7.5÷0.5= =
20.1+9.09= ×= ﹣= 1÷0.1﹣1×0.1=
（+）×63= 0.5÷= 0.4÷40%= 0.42﹣0.32=
m，宽是
m，它的长是多少米？
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