画一个直径为5cm的圆，并标出圆心、半径、直径．
直接写出得数． ①1÷= ②3﹣1= ③×3= ④3.6×= ⑤+3.75= ⑥﹣= ⑦1﹣2÷7= ⑧36×（+）=
直接写出得数×=×12= 0.25÷2.5%= 51.3÷0.01= 4﹣= 0.75÷0.25=÷=×8÷8×=
直接写出得数．+=﹣=×=÷=×=﹣0.8=+=÷4= 3.5﹣2.9= 36.4÷100= 1.7×0.3= 4.8+2=×21= 9.82﹣0.2= 0.8÷0.002= 2.5×1.7×4=
直接写得数． 5×= 4.5×0.5×4== 0.82+0.7=
直接写出得数． 5×=×=÷= 0.75+1.5=
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×12= 0.25÷2.5%= 51.3÷0.01=
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