1．若a b互为相反数,a与2的根方互为倒数,求（1+a).(1+b)的值
2．已知a平方＝4,b的立方＝-27,求a的b次方的值
都要解题的过程.
人气：304 ℃ 时间：2020-06-25 20:20:57
解答
1.
a=-b,a=1/根下2,则b=-1/根下2
代入（1+1/根下2）（1-1/根下2）=1-1/2=1/2
2.
a^2=4则a=2或-2
b^3=-27则b=-3
当a=2时,2^(-3)=1/8
当a=-2时,（-2）^(-3）=-1/8
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