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﹣
=
﹣
= 
﹣
= 
+
= 
+
=
相关试题
心算．
2.3+2.2= 5.62﹣2.02= 0.25+1.8=
9.5﹣1.3= 1.3﹣0.8= 3.5﹣0.5=
1.95÷3.05= 2.3+1.6= 5.31﹣2.01=
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