帮忙解一下这道题最简二次根式√m²-7与√8m+2是同类二次根式,求m的值.
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帮忙解一下这道题最简二次根式√m²-7与√8m+2是同类二次根式,求m的值.
帮忙解一下这道题最简二次根式√m²-7与√8m+2是同类二次根式,求m的值.
帮忙解一下这道题最简二次根式√m²-7与√8m+2是同类二次根式,求m的值.
因为最简二次根式√m²-7与√8m+2是同类二次根式,所以 m^2-7=8m+2
m^2-8m=2
m^2-8m+16=25
(m-4)^2=5^2
m-4=5
m=9