弟弟有课外书20本，哥哥有课外书25本，哥哥给弟弟多少本后，弟弟的课外书是哥哥的2倍？
直接写出得数+= ﹣= ÷= 0.37+1.6=
+= ÷= 12.6﹣6.06= 201+75= ×=
直接写出得数：﹣= 6×= 0÷= ×=+= ÷= ×= ×=
+= ﹣= += +=1+= 2﹣1= ﹣= 3﹣=1+2= ×= 7﹣4= ×13=×4= 8×= ÷= 5÷=÷8= 8÷= 3÷= ÷=
直接写得数．1﹣+= 1.25×0.8= 72÷= 10.6﹣5.62=0.33= 11.1÷0.3= ×= 4.1×25+3.9×25=
+
= 
﹣
= 
÷
= 0.37+1.6=
+
= 
÷
= 12.6﹣6.06= 201+75= 
×
=
﹣
= 6×
= 0÷
= 
×
=
+
= 
÷
= 
×
= 
×
=
+
= 
﹣
= 
+
= 
+
=
+
= 2
﹣1
= 
﹣
= 3
﹣
=
+2
= 
= 7﹣4
= 
×13
=
×4= 8×
= 
÷
= 5÷
=
÷8= 8÷
= 3
÷
= 
÷
=
+
= 1.25×0.8= 72÷
= 10.6﹣5.62=
×
= 4.1×25+3.9×25=
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