下图是一个以O点为圆心的圆，请在图内先画出一条直径d，再画一条垂直于已画直径的半径r．
×=÷=×= 2×=÷=÷3=+=﹣=
直接写出得数 3×= ×= ×18= ×= = ÷= ÷= 3×= ．
直接写得数．========
12+9.9= 1÷0.25=÷=×50%=﹣=（0.75﹣）×96=
直接写得数．+= 6÷=÷4= 2×=÷5= 24÷=×=÷=×24=×=÷=×=
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×18= 
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×50%=
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=（0.75﹣
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= 6÷
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÷4= 2×
÷5= 24÷
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