求下面各组数的最大公因数和最小公倍数．9和15 7和9 11和33 12和28．
直接写得数． 12×= 6÷=÷= 1÷×=×18=×0×=×=×26=
直接写出得数．×60= 12÷= 3.14×42=（）2=×=+=÷=÷=
直接写得数．×4=+=+=÷= 25÷=﹣=÷5=×= 2÷=﹣=×12= 2﹣﹣=
口算========
直接写出得数．== 11=== 0÷1.2======= 12=== 54=
= 6÷
=
÷
= 1÷
×
=
×18=
×0×
=
×
=
×26=
×60= 12÷
= 3.14×42=（
）2=
×
=
+
=
÷
÷
=
×4=
+
=
+
=
÷
=
=
﹣
=
×
=
=
﹣
=
=
=
=
=
=
=
=
=
=
=
= 11
=
=
= 0÷1.2=
=
=
=
=
=
=
=
=
= 54
=
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