牧羊人赶着一群羊去放牧，跑走了一只公羊后，他发现剩下的羊中公羊和母羊的比是9：7．过了一会儿，跑走的公羊回到羊群，却又跑走了一只母羊，这时公羊与母羊的比是7：5．这群羊原来有多少只？
计算 ×÷÷．
直接写出得数．÷5= ÷4= ÷2= ÷3=÷= ÷= ÷= ÷=1÷= 15÷= ÷= ÷=×= ×= += 1﹣=
先看清左右两题之间的关系，再写出得数．
= = == = == 1.05×4= 268÷14×0== 306﹣16= 5.1+0.09=
直接写出得数．﹣= ÷= 9÷3=9.8÷0.7= 3÷×3= ÷5=×1.6= 15×60%= 25×40%=2÷100%=
×
÷
÷
．
÷5= 
÷4= 
÷2= 
÷3=
÷
= 
÷
= 
÷
÷
=
= 15÷
= 
÷
= 
÷
=
×
×
= 
+
= 1﹣
=
= 
= 
=
= 
= 
=
= 1.05×4= 268÷14×0=
= 306﹣16= 5.1+0.09=
﹣
= 
÷
= 9
÷3=
×3= 
÷5=
×1.6= 15×60%= 25×40%=
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