320+60= 670﹣500= 400﹣260= 650﹣180= 37万+35万= 100万﹣67万=
90×60= 810÷9= 199+85= 4×12×25= 90÷2÷3= 1﹣
=
0÷58= 
+
= 
﹣
= 
+
=
320+60= 670﹣500= 400﹣260= 650﹣180= 37万+35万= 100万﹣67万=
90×60= 810÷9= 199+85= 4×12×25= 90÷2÷3= 1﹣=
0÷58= += ﹣= +=
+
=
﹣
=
+
= 1﹣
=
+
﹣
=
+8=
﹣
+
+
= 1﹣
=
，鸡和鹅共占总数的
，鸡占总数的几分之几？
+
=
+
=
+
+
=
﹣（
）=
=
﹣
=（
﹣
）×0= 5﹣
﹣3
=
+
﹣
+
﹣
5﹣
﹣
．
+
+
=
+
+
+
=
﹣（
+
）=
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