如图，边长为4的正方形中依次挖去了四个半圆．阴影部分的面积是多少？（答案用л表示）
÷2=+= 10÷=×6=×=÷= 9×= 15×（﹣）=
直接写得数=== 15.7+3==== 10+10%= 3﹣3÷5= 0.9×99+0.9=
1﹣65%= 1﹣1÷6= 0.32= 40×5%=+= 25%÷= 1﹣+= 0.125×0.125=
看谁算得快×=×÷×= 0.35×99=÷= 79﹣0.79=+= 10÷1%= 32×1.25%=
直接写出得数．×== 1.25×0.16×8= 2.6﹣1.7= 44÷=×=××==×16+×16= 0.6+99×0.6=
÷2=
+
= 10÷
=
×6=
×
=
÷
= 9×
= 15×（
﹣
）=
=
=
= 15.7+3=
=
=
= 10+10%= 3﹣3÷5= 0.9×99+0.9=
+
= 25%÷
+
= 0.125×0.125=
×
=
×
÷
×
= 0.35×99=
÷
=
+
= 10÷1%= 32×1.25%=
×
=
=
=
×
=
×
×
=
=
×16+
×16= 0.6+99×0.6=
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