如图的统计图是某学校图书馆购进三种用书所占百分比情况．请你看图回答问题．（1）已知科技书有325本，这三种图书一共有 本．（2）文艺书有 本．（3）连环画比文艺书少 本．
直接写出得数． 1÷= 1﹣﹣=×==×12=（3+）×0=÷=+=
计算：﹣= 18×===×12=÷2=+=﹣=
===================== 2.5×16======== 1.5÷0.05== 1.5÷0.05==== 2.5×0.4============ 6.25+1.75===============
直接写出得数+=﹣= 0÷6= 39×= 15﹣= 1÷= 21÷=（+）×6=×÷×= 8×﹣=
直接写出得数．========
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