当x______时，（x-4）0等于1．-数学

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• 计算（1）a2a-5-25a-5（2）（3×10-4）3÷（9×10-7）-数学
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• （1）计算：|-3|-4+（-2）0-（13）-1（2）计算：（2aa-1-aa+1）•a2-1a．-数学
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• 解方程：（1）25x2=9（2）（x-5）3+27=0计算：（3）0.49-378-1-(-3)2（4）|5-3|-|4-5|-(3-π)0．-数学
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• 2-2=（）A．14B．-14C．4D．-4-数学
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