求下列每组数的最大公因数和最小公倍数．9和10 100和25 28和42．
直接写得数．+=﹣= 0.2﹣=+=﹣=+2÷9= 2﹣﹣= 1.55﹣= 1﹣﹣+= 0.5﹣﹣=
计算．===== 1﹣===
看图计算下面各题．+= +=
计算下列各题：========
观察下面各式，算一算，你能发现什么规律？+=+=+=×=×=×=
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= 0.2﹣
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+2÷9=
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= 1.55﹣
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= 1﹣
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×
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×
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×
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