张师傅加工一批零件，第一天完成 的个数与未完成的个数比是1：4，如果再加工15个，就完成了这批零件的一半，张师傅第一天完成了多少个零件？
直接写出得数．÷6= 15÷= ×=÷= 42×= ﹣60%=10﹣99%= 40%×=
直接写出得数．24×= 1÷=×12= ×18÷3=÷= （﹣）×=×÷×=
直接写得数．= = = = = == = = = = =
直接写得数．×= ×12= ×=÷= ÷= 9×=÷═ ÷12=
直接写得数．= = =3.2÷40%= = == =
÷6= 15÷
= 
×
=
÷
= 42×
= 
﹣60%=
=
= 1÷
=
×12= 
×18÷3=
÷
= （
﹣
）×
=
×
÷
= 
= 
= 
= 
= 
=
= 
= 
= 
= 
= 
=
×
= 
×12= 
×
=
÷
= 
÷
= 9×
=
÷
═ 
÷12=
= 
= 
=
= 
=
= 
=
粤公网安备 44130202000953号