用简便方法计算①8.36﹣0.75﹣ ②99+992 ③×25+×10．
递等式计算++ 1﹣﹣ 1﹣+．
﹣+．
．
+=+=+=﹣=﹣=+=﹣=+=
直接写出得数 1﹣1÷7= 13×99== 60×25%=== 20÷0.1%= 4.05﹣1.9=）2﹣）2= 24×=
②99+992 ③
×25+
×10．
+
+
﹣
+
．
﹣
+
．
．
+
=
+
=
+
=
﹣
=
﹣
+
=
﹣
=
+
=
= 60×25%=
=
= 20÷0.1%= 4.05﹣1.9=
）2﹣
）2= 24×
=
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