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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...

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• 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...

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• [科目]数学(1)x6÷x3=x2；(2)z5÷z4=z；(3)a3÷a=a；(4)(-c)4÷(-c)2=-c2 例3 计算：(1)a[(a2)4÷(a2)2]；(2)(x-y)2n+1÷(y-x)2n·(x2+xy+y2)...