写出下面各小数
++++﹣﹣++﹣﹣ 1﹣++﹣．
计算：= 1﹣====== 1﹣===
+ =﹣ = = 改正：
用推算计算 （1）+= （2）﹣=
计算： 2.5×40= 18×6= 1.73+2.07= 10﹣0.9= 400÷4=+=﹣=+=﹣=﹣=
+
+
+
+
﹣
﹣
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+
﹣
﹣
1﹣
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﹣
．
= 1﹣
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=
=
=
=
= 1﹣
=
=
=
+
﹣
+
=
﹣
=
+
﹣
=
+
=
﹣
=
﹣
=
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