如图中阴影部分的面积是25平方厘米，求圆环的面积．（л取3.14）
口算×=÷8= 0.375×= 4.2+= 24÷= 3×3×3= 63×10%= 1.5×0.4= 3.14×6= 0.18÷3=
直接写出得数．========
直接写得数： 3﹣=÷=×=÷6= 9.1÷7=÷=+=÷= 4×=×=
直接写出得数． 3×=×=+= 16×=÷= 1﹣= 9÷= 0÷110=
直接写得数．×16= 12÷= 0.3×=÷= 1÷=×÷=×÷×= 0×+=﹣=+=×=÷=
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÷8= 0.375×
= 4.2+
= 24÷
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÷6= 9.1÷7=
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= 4×
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= 16×
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= 1﹣
= 9÷
= 0÷110
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×16= 12÷
= 0.3×
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