圆的直径等于半径的一半． ．
直接写出得数．========
直接写得数．+= 1﹣=﹣=+=﹣= 25÷26=+= 1﹣+=
直接写出答案 9.7﹣8= 3﹣0.5= 2+0.4=+=﹣= 2.5﹣2 1+0.8=+= 0.625+= 1﹣1=
填空并列式计算．
计算正确的打“√”，错误的改正过来
=
=
=
=
=
=
=
=
+
= 1﹣
﹣
=
+
=
﹣
= 25÷26=
+
= 1﹣
+
=
+0.4=
+
=
﹣
= 2.5﹣2
+0.8=
+
= 0.625+
=
﹣1
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