6.4×2.5+2
×3.4+25% 15.7×7.7+1.57×22+1.57
12.56﹣（
+2.56+
） 
×
﹣
×
2010×
3.65÷〔0.1÷（2.1﹣2.09）〕
6.4×2.5+2×3.4+25% 15.7×7.7+1.57×22+1.57
12.56﹣（+2.56+） ×﹣×
2010× 3.65÷〔0.1÷（2.1﹣2.09）〕
=
=
=
=
=
=
=
=
=
=
，男生人数比女生少
，女生人数是男生人数的
÷6=
×
= 40×（
﹣
）=
= 1÷
×
=
÷
=
×
= 5×
×
= 5+
，这个数是多少？
．
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