kx²-(2k+1)x+k=0的△得多少
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kx²-(2k+1)x+k=0的△得多少kx²-(2k+1)x+k=0的△得多少kx²-(2k+1)x+k=0的△得多少△=(-(2k+1))^2-4kk=(2k+1)^
kx²-(2k+1)x+k=0的△得多少
kx²-(2k+1)x+k=0的△得多少
kx²-(2k+1)x+k=0的△得多少
△=(-(2k+1))^2-4kk
=(2k+1)^2-4k^2
=4k^2+4k+1-4k^2
=4k+1
4k+1