Naomi 做银首饰,对于一种风格的耳环,她从一个银盘上削下许多的楔形板.如图所示,每一个楔形板占40°的圆心角,如果每个银盘有2.5g 每个楔形板多重?
P.S 很简单诶
Naomi makes silver jewelry.For one style of earrings,she cut
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