已知a=根指数x-y根号下x+y+3是x+y+3的算术平方根b=根指数x-2y+3根号x+2y是x+2y的立方根求b-a的立方根
人气：124 ℃ 时间：2019-08-18 01:21:38
解答
a=根指数x-y根号下x+y+3是x+y+3的算术平方根→x-y=2①
b=根指数x-2y+3根号x+2y是x+2y的立方根→x-2y+3=3②
由①②得x=4,y=2→a=√9=3,b=³√8=2→b-a=2-3=-1
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