先化简,再求值 (x+2)(x-2)+(x-2)2+(x-4)(x-1)其中X눀-3X=1

2025-01-06 01:52:12
推荐回答(1个)
回答1:

(x+2)(x-2)+(x-2)²+(x-4)(x-1)
=x²-4+x²-4x+4+x²-5x+4

=3x²-9x+4

=3(x²-3x)+4
=3*1+4
=7