（1）计算：|-1|-4+(π-3)0+2-2；（2）化简求值：a-ba÷(a-2ab-b2a)，其中a=2011，b=2010．-数学

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• 解答题（1）计算22+(-12)-2-3-1+19+(π-3.14)0；（2）先化简，再求值：x2-2xx2-1÷(x-1-2x-1x+1)，其中x=2019；（3）解方程：63x-8=1-4x-78
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