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计算:(1)x2•(﹣x3)4(2)5a2b2c÷(﹣4ab2)

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8,6,4,1  8,6,3,2  8,8,4,1  8,6,4,2  
8,6,4,1  8,6,3,2  8,8,4,1  8,6,4,2  
I(1)>I(2)=I(3)>I(4)=I(5)  I(1)>I(2)<I(3)>I(4)=I(5)  I(1)>I(2)>I(3)<I(4)=I(5)  I(3)>I(2)<I(1)>I(4)=I(5)  
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