已知x2-5x=14求(x-1)(2x-1)-(x+1)2+1的值要详细的过程、
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已知x2-5x=14求(x-1)(2x-1)-(x+1)2+1的值要详细的过程、
已知x2-5x=14求(x-1)(2x-1)-(x+1)2+1的值
要详细的过程、
已知x2-5x=14求(x-1)(2x-1)-(x+1)2+1的值要详细的过程、
(x-1)(2x-1)-(x+1)2+1
=2x²-3x+1-x²-2x-1+1
=x²-5x+1
=14+1
=15
(x-1)(2x-1)-(x+1)2+1
=2x²-3x+1-x²-2x-1+1
=x²-5x+1
=14+1
=15
(x-1)(2x-1)-(x+1)2+1
=2x²-3x+1-x²-2x-1+1
=x²-5x+1
=14+1
=15
能帮到你吗
15