直接写得数.
900×6= 70×7= 80×9= 60×5=
720÷8= 630÷9= 250÷5= 420÷7=
58×6≈ 79×4≈ 37×7≈ 313×9≈
﹣
=
+
=
﹣
= 1﹣
=
﹣
=
﹣
=
+
=
+
=
直接写得数.
900×6= 70×7= 80×9= 60×5=
720÷8= 630÷9= 250÷5= 420÷7=
58×6≈ 79×4≈ 37×7≈ 313×9≈
﹣
=
+
=
﹣
= 1﹣
=
﹣
=
﹣
=
+
=
+
=
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