设, , , , , , 都是整数，试说明：在中，必有奇数个偶数．
直接写数对又快：+= ﹣= 2012×=56÷11×165÷7= ×[0.75+（﹣）]= 40÷[×（+）]=
口算．80×20%= 24×0.2= 5﹣= ÷3= 32=36÷12%= 1﹣0.3= 2.1+3.25= ×1.8= （0.2）2×52=
直接写出得数．2.8÷0.125= 4.38﹣3.42+5.62﹣2.08= == 9.08×9+9.08= =
直接写出得数．④36.36÷36=②×=③2.5×1.5×4=
直接写得数．1÷0.05= 0.325+= （0.2）2=10﹣0.01= = 3.1×0.7=
, 
, 
, 
, 
, 
, 
都是整数，试说明：
中，必有奇数个偶数．
+
= 
﹣
= 2012×
=
×[0.75+（
﹣
）]= 40÷[
+
）]=
= 
÷3= 32=
﹣0.3= 2.1+3.25= 
×1.8= （0.2）2×52=
=
= 9.08×9+9.08= 
=
×
=
= （0.2）2=
= 3.1×0.7=
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