计算．35×2= 135÷3= 72×5= 630÷9=85÷5= 189÷9= 76×2= 45×8=
直接写出得数.+= 1﹣=+=++=﹣=+2=﹣= 1﹣﹣=+﹣=﹣+﹣=
直接写得数．==== 49÷7= 74﹣47= 985×0= 300×4= 300+1070= 48÷5= 4×3+2= 5×8﹣7= 510×7≈ 48×5≈ 397×3≈ 121×4≈
直接写出得数.+=﹣=+=﹣=﹣=+= 1﹣=﹣=+=+=
直接写出得数．= 6﹣==== 5﹣===
计算下面各题，怎样计算简便就怎样计算．++．
+
= 1﹣
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+
=
+
+
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﹣
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+2=
﹣
= 1﹣
﹣
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﹣
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﹣
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﹣
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+
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﹣
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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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= 6﹣
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= 5﹣
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+
+
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