计算：（1）3-27-9+(2)2+20130（2）3（a+1）2-（2a+1）（2a-1）-数学

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• I only intended to be there for a few days, but Iended up staying for a whole month.A．fortunatelyB．a
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• （1）计算：4+（-2010）0-1；（2）解方程：3x=2x-1-数学
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• 计算：（1）4+(-2008)0-(13)-1+|-2|（2）（x-y+9）（x+y-9）（3）[（3x+4y）2-3x（3x+4y）]÷（-4y）（4）a2-b2a2b-ab2÷(1+a2+b22a
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• （1）解方程：（x-3）2+4x（x-3）=0．（2）解方程：2x2-4x-7=0（3）计算：12+|3-2|+(2-π)0．（4）24-12-2(3-1)．-数学
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