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• ·珠宝教程 七月红蓝宝石的质量评价-No·46·宝殿(3)计算出灰区1克拉宝石的价格为：50000÷30=1700美元(约1,4000元人民币)。...(3dxy,3dyz,3dzx)在低能阶，(3dx2-y2,dz2)在高能阶。由于Cr(III)的电子组态是3...

• 整式乘除(1)28x4y2÷7x3y；(2)-5a5b3c÷15a4b3；解：(1)28x4y2÷7x3y=(28÷7)x4-3·y2-1=4xy；(4)(6x2y3)2÷(3xy2)2=36x4y6÷9x2y4=4x2y2.课堂练习四、小结1.单项式除以单项式...

• 关于证切线和化简分式一类问题 爱问知识人化简9a2b2 3a2b-6ab2,并说明化简的根据是什么?4.求分式1 2a-2b，2 3a2b(b-a),...=[(y(x-y)2·x-y x)-x y(x-y)]÷1xy=[y x(x-y)-x y(x-y)]÷1 xy=y2-x2·xy·...