下面计算对吗？把不对的改证过来．改为： 改为： ． 改为： ． 改为： ．
×=÷=×= 2×=÷=÷3=+=﹣=
直接写出得数 3×= ×= ×18= ×= = ÷= ÷= 3×= ．
直接写得数．========
12+9.9= 1÷0.25=÷=×50%=﹣=（0.75﹣）×96=
直接写得数．+= 6÷=÷4= 2×=÷5= 24÷=×=÷=×24=×=÷=×=
改为： 
． 改为： 
． 改为： 
．
×
=
÷
=
×
=
=
÷3=
+
=
﹣
=
= 
×
= 
×18= 
×
= 
= 
÷
= 
÷
= 3×
= ．
=
=
=
=
=
=
=
=
÷
=
×50%=
﹣
=（0.75﹣
）×96=
+
= 6÷
=
÷4= 2×
÷5= 24÷
=
×
=
÷
×
=
÷
=
×
=
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