已知：2m+2的平方根是±4,3m+n+1的算术平方根是5,求m+2n的值.
人气：394 ℃ 时间：2019-08-21 05:20:49
解答
根号2m+2=正负4
开根号：2m+2=16
m=7
根号3*7+N+1=正负5
开平方根：N+1=25-22
N=3
M+2N = 7+2*3=13
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