1.若a²=9,则a= 若a³=8,则a= 若|a|=5,则a=
问题描述:
1.若a²=9,则a= 若a³=8,则a= 若|a|=5,则a=
2.(-1又1/5)²÷3/5×(-5/12)
3.(-1/2)²+1/2×(2/3-|2/3-2|)
4.-2的5次方÷(-4)×(1/2)²-12×(-15+2的四次方)³
5.2又2/9×(-1又1/2³)-(-1.2)²÷0.4²
6.-2的四次方-(-2)²-3²÷(-1又1/2)
答
1.若a²=9,则a=±3 若a³=8,则a= 2 若|a|=5,则a=±52.(-1又1/5)²÷3/5×(-5/12)=36/25×5/3×﹙﹣5/12﹚=﹣36/25×25/36=﹣13.(-1/2)²+1/2×(2/3-|2/3-2|)=1/4﹢1/2×﹙﹣2/3﹚=1/4﹣1/3=﹣1/12...