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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...