世界上最大的洲是亚洲面积是4400万平方千米,最小的洲是大洋洲,亚洲的面积比大洋洲面积的4倍还多812万平方千米.大洋洲的面积是多少万平方千米?
直接写得数= 32×25%= 0.75+2.5= 3600÷30== ×5= 0.32= 4×25﹣25=×0.5=1 1÷10+0.9= （）×20= =
直接写得数：+= ÷= 1﹣5÷8= ×= ×=0.9+99×0.9= 1÷0.6= 14÷35= ÷×÷= 17.3÷1.73=
直接写出得数+= += ﹣0.125= ﹣= +0.3=10﹣= ×= ×= ×= 10×=
口算：﹣= += ×= 25×10%=
直接写得数．﹣= 3+1= ×6= 7.43﹣1.4﹣2.6= 1÷=5.1+0.3= 0÷（﹣）= 25×4= 5.4÷0.3=
= 32×25%= 0.75+2.5= 3600÷30=
= 
×5= 0.32= 4×25﹣25=
）×20= 
=
+
= 
÷
= 1﹣5÷8= 
×
×
=
÷
+
= 
+
= 
﹣0.125= 
﹣
= 
+0.3=
= 
×
= 
×
= 
×
= 10×
=
﹣
= 
+
= 
×
= 25×10%=
﹣
= 3+1
= 
×6= 7.43﹣1.4﹣2.6= 1÷
=
﹣
）= 25×4= 5.4÷0.3=
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