在一条马路的两侧种树，每隔10米种一棵，每侧首尾两棵树间距离为240米，一共要种多少棵树？
直接写出得数．========
口算．== 5﹣== 0×1= 1÷===
直接写得数．========
直接写得数+=÷7=×=÷=×8= 9÷= 15×=﹣=÷=×=×=÷=
直接写出得数．+=×=÷6=×8=+= 2﹣= 0+=÷= 1÷=﹣=
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= 5﹣
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= 1÷
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÷7=
×
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÷
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×8= 9÷
= 15×
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÷
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×
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÷
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+
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×
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÷6=
×8=
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= 0+
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÷
= 1÷
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﹣
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