∵2x-1的平方根为±3,3x+y-1的平方根为±4,
∴2x-1=9,3x+y-1=16,
解得:x=5,y=2,
∴x+2y=5+4=9,
∴x+2y的平方根为±3.
已知2x-1的平方根为±3,3x+y-1的平方根为±4,求x+2y的平方根.
已知2x-1的平方根为±3,3x+y-1的平方根为±4,求x+2y的平方根.
数学人气:425 ℃时间:2020-04-16 05:58:04
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