题文
口算．
﹣
= 
÷
= 
÷7= ×
=
1﹣40%= 1÷37.5%= 2.1×
= 82=
×4÷×4= 20×（
+
）= 9.9×99+9.9= π+
π=
口算．﹣= ÷= ÷7= ×=
1﹣40%= 1÷37.5%= 2.1×= 82=×4÷×4= 20×（+）= 9.9×99+9.9= π+π=
试题篮
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