图书室有故事书522万本，比文艺书多520万本，少儿科技书的本数正好是文艺书的2倍，学校图书室共有科技书多少万本？
画一画． （1）= （2）÷4=
直接写结果：×3= 1÷= 1﹣﹣=×= 3﹣4×=×12=÷=+= 1﹣﹣=﹣=
直接写出得数×3=×=﹣0.25= 72×=÷=÷= 36÷=÷=
直接写得数．×16= 12÷= 0.3×=÷= 1÷= 0×===
直接写得数 4÷= 0×=÷=×1.4=×= 0÷=×10= 30×0.05=
=
÷4=
×3= 1÷
= 1﹣
﹣
×
= 3﹣4×
=
×12=
÷
=
+
= 1﹣
﹣
=
﹣
=
×3=
×
=
﹣0.25= 72×
=
÷
=
÷
= 36÷
=
÷
=
×16= 12÷
= 0.3×
=
÷
= 1÷
= 0×
=
=
=
= 0×
=
÷
×1.4=
×
=
×10= 30×0.05=
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