在一块半径是5米的圆形草地的中间修一个边长为3米的正方形花坛后，草地面积还剩下多少平方米．
×16=×=﹣=×= 6÷=÷=÷4=÷=+=﹣= 100×= 8×= 1÷=﹣= 12÷= 0×=
直接写得数．×0=×=×12=×= 45×=÷=×=÷= 18×=×= 1÷=÷=
直接写出得数．×12=÷=（ ）2= 4﹣4×= 1×= 43÷=÷=×8+×8= 0.9×= 12×﹣=×7÷×7==
直接写出得数．÷= 0×=÷=÷1=÷= 1+=×=×=
直接写出得数． 12×=+=÷8=﹣=
×16=
×
=
﹣
=
×
=
=
÷
=
÷4=
÷
=
+
=
﹣
= 100×
= 8×
=
﹣
= 12÷
= 0×
=
×0=
×
=
×12=
×
=
=
÷
=
×
=
÷
=
=
×
= 1÷
=
÷
=
×12=
÷
=（ 
）2= 4﹣4×
= 1
×
= 43÷
=
÷
=
×8+
×8= 0.9×
= 12×
﹣
×7÷
=
÷
=
÷
=
÷1=
÷
= 1+
=
×
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×
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+
÷8=
﹣
=
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