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一、填空。（12％）（1）我国第五次人口普查结果显示,全国总人口已达十二亿九千五百三十三万,这个数写作_。省略亿后面的尾数写成“亿”作单位的数是_。（2）20:（）=4/5=（）/60（3）把2（9/16）化成小数是_;把18/7化成带分数是_。（4）（4/5）:8的比值是_,如果写一个比和它组成比例,那么组成的比例可以是_。（5）把42分解质因数:_。（6）60平方分米=_平方米（7）全世界有200来个国家,其中缺水的国家有
First, fill in the blank. (12%) (1) According to the results of the fifth national census in China, the total population in the country has reached 1.2593 billion, which is written as _. Ellipsis behind the mantissa written as “billion” for the number of units is _. (2) 20: () = 4/5 = () / 60 (3) Convert 2 (9/16) into a fraction of _; convert 18/7 to a fraction of _. (4) (4/5): The ratio of 8 is _, and if you write a ratio that is proportional to it, the ratio can be _. (5) the quality factor of 42: _. (6) 60 square decimeters = _ square meters (7) There are 200 countries around the world, of which the water-deficient countries have