图书室的童话故事类图书有345本，漫画类图书的数量是童话故事类图书的2倍，漫画类图书的数量大约有多少本？
计算75× ×13 × ×× ÷ × ×÷ × ÷ ÷÷ ÷ ÷21．
×= ÷6= ÷= 1÷=×= ﹣= += 6÷=0÷= ×= = =
直接写出得数．18×= ÷= 0.25×3.2×4= 32×（1﹣0.99）=25%×4= 0÷= ÷= ×÷×=
直接写得数72×= 1.25×8= 2.9+6.1= +=÷= ×= 25÷75= ÷=1.2×= 5÷=
直接写出得数．①×4= ②0.5+1= ③3×= ④2﹣0.7=⑤2÷0.7= ⑥3.5﹣﹣2= ⑦6×（+）= ⑧5.5×4+5.5×6=⑨4﹣（+1）= ⑩4÷4=
×13 
×
×
×
÷
×
×
÷
×
÷
÷
÷
÷
÷21．
×
= 
÷6= 
÷
= 1÷
×
= 
﹣
= 
+
= 6÷
=
= 
= 
= 
=
= 
÷
= 0.25×3.2×4= 32×（1﹣0.99）=
÷
×
÷
= 1.25×8= 2.9+6.1= 
+
=
÷
= 
×
= 25÷75= 
÷
=
= 5÷
=
×4= ②0.5+1
×
= ④2
= ⑦6×（
+
﹣（
）= ⑩4
÷4=
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