读出下列各数，并改写成用亿作单位的近似数：2012年上半年A市某公司开发新产品产值达7590000000元，创利润579000000元，税收309000000．
直接写得数．+= 20×= 0.36÷0.6= ﹣= ÷2=3.5﹣3.05= ÷= 7×（+）=
直接写出得数．+= ﹣= 12×÷9= ÷3×75= ×14=20÷= ×= 0×3= ÷= ÷=
直接写得数502﹣197= 8.01﹣2.1= 2.5×40= 0.33= 5.2÷0.125÷8== = = = 12.5÷（10%÷10）=
直接写出得数．180÷6= 12.25﹣0.5= ﹣0.5= 202= 23+177%= 2.5×4=﹣= 3π= ×= += 0.6÷= 2÷1%=
350×0.02= 1﹣25%= 1+15%= 12﹣7.9=×= ﹣= （﹣）×24= 16×=131131÷131= ××0= 1÷﹣÷1= 12.5×0.08=0.9+99×0.9= 7.8×0.25×4= ﹣+= 0.52×100=×8+8×= ×21×= 98﹣0.23﹣0.77= +÷=44÷= 9300÷5÷6= 0÷= 1997+1998+1999+6=
+
= 20×
= 0.36÷0.6= 
﹣
= 
÷2=
÷
= 7×（
+
）=
+
= 
﹣
= 12×
÷9= 
÷3×75= 
×14=
= 
×
= 0×3= 
÷
÷
= 
= 
= 
= 12.5÷（10%÷10）=
﹣0.5= 202= 23+177%= 2.5×4=
﹣
= 3π= 
×
= 
+
= 0.6÷
= 2÷1%=
×
= 
﹣
= （
﹣
=
×
×0= 1÷
﹣
﹣
+
= 0.52×100=
×8+8×
= 
×21×
= 98﹣0.23﹣0.77= 
+
= 9300÷5÷6= 0÷
= 1997+1998+1999+6=
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