3x^2-2x+7与4x^2-2x+7比大小
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3x^2-2x+7与4x^2-2x+7比大小3x^2-2x+7与4x^2-2x+7比大小3x^2-2x+7与4x^2-2x+7比大小(3x^2-2x+7)-(4x^2-2x+7)=3x^2-2x+7-
3x^2-2x+7与4x^2-2x+7比大小
3x^2-2x+7与4x^2-2x+7比大小
3x^2-2x+7与4x^2-2x+7比大小
(3x^2-2x+7)-(4x^2-2x+7)
=3x^2-2x+7-4x^2+2x-7
=-x^2≤0
所以3x^2-2x+7≤4x^2-2x+7
4x二次方-2x+7大于或者等于3x二次方-2x+74x二次方-2x+7减去3x二次方-2x+7等于X的平方由于X的平方大于或者等于0所以4x二次方-2x+7大于或者等于3x二次方-2x+7
其实原二式所不同的地方就是
3x^2与4x^2前边的3和4这两个系数，而且不存在负值，因此结果应该是：当x不等于0时，则
3x^2-2x+7小于4x^2-2x+7；当x＝0时则3x^2-2x+7＝4x^2-2x+7
前者小于后者：前者-后者=-x^2<0
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3x^2-2x+7与4x^2-2x+7比大小
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