我买了40个羽毛球，共用了210元．每个羽毛球大约多少元？
直接写得数．=======（﹣）×30=
直接写出得数． 14×=×5=×= 12×= 3×= 7×= 4.8+0.82= 3﹣2.7=（+2）×9=（﹣）×2=
口算题．×=×=×9=××0=+=×11= 5﹣﹣=×9×7=
口算×15=×2=×=×=×= 1×=×=×34=×=×=×=×=×=×=×=×24=×=×30= 28×=×=
直接写出得数×15=×2=×=×= 1×=×=×34=×=×=×=×=×=
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×5=
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= 4.8+0.82= 3
﹣2.7=（
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×24=
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