140÷2= 240÷6= 300÷6= 490÷7=40÷4= 180÷3= 40×7= 0÷18=
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直接写出得数．== 1﹣= 4﹣=====
计算下面各题．．
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++﹣+﹣+﹣．
=
=
=
=
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=
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= 1﹣
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=
=
=
=
=
．
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=
=
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=
=
+
+
﹣
+
﹣
+
﹣
．
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