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一個數a的絕對值就是數軸上表示a的點到原點(零點)的距離,可以表示為|a|
2.5的2011次方乘以-0.4的2012次方 =2.5的2011次方×0.4×0.4的2011次方 =(2.5×0.4)的2011次方×0.4 =1的2011次方×0.4 =0.4
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