x-5x=14
-4x=14
x=-7/2
(x-1)(2x-1)-(x+1)+1
=(-7/2-1)×[2×(-7/2)-1]-(-7/2+1)+1
=(-9/2)×(-8)-(-5/2)+1
=79/2
已知x-5x=14,求(x-1)(2x-1)-(x+1)+1的值
已知x-5x=14,求(x-1)(2x-1)-(x+1)+1的值
数学人气:348 ℃时间:2019-10-19 13:23:27
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