在边长为6厘米的正方形内任取一点，将正方形的一组对边二等分，另一组对边三等分，分别与点连接,求阴影部分面积．
计算下面各题．×21×÷5×÷÷÷÷24×÷8．
计算．×9=×0= 0÷=÷= 12×=×=÷=÷=
直接写得数×=÷5=×12=×=÷=÷=×= 1÷== 45×=÷2=÷=×=÷=×0=×= 1﹣=÷=×= 15÷=
口算×6=+=×=×6=÷=÷= 1﹣=﹣=×4=÷=
直接写得数．×= 0×=÷=÷4= 12÷= 0.3×=×÷×= 0×+=
内任取一点
，将正方形的一组对边二等分，另一组对边三等分，分别与
×21×
÷5×
÷
÷
÷
÷24
×
÷8．
×9=
×0= 0÷
=
÷
=
×
=
÷
=
÷
=
×
=
÷5=
×12=
×
=
÷
÷
=
×
= 1÷
=
= 45×
=
÷2=
÷
=
×
=
=
×0=
×
= 1﹣
=
÷
=
×
= 15÷
=
×6=
+
=
×
=
×6=
÷
=
÷
= 1﹣
=
﹣
=
×4=
÷
=
×
= 0×
=
÷
=
÷4= 12÷
= 0.3×
=
×
÷
×
= 0×
+
=
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