(x+1)(x²+x+1)-(x-1)(x²-x+1)=(4x+3)(x-2) 2x(x+1)-(3x-2)x+21²=x²+1

2024-12-01 01:18:55
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回答(1):

(x+1)(x²+x+1)-(x-1)(x²-x+1)=(4x+3)(x-2)
(x³+2x²+2x+1)-(x³-2x²+2x-1)=4x²-8x+3x-6
4x²+2=4x²-5x-6
5x=-8
x=-8/5

2x(x+1)-(3x-2)x+21²=x²+1
2x²+2x-3x²+2x+441=x²+1
2x²+4x-440=0
x²+2x=220
x²+2x+1=221
(x+1)²=221
x+1=±√221
x=-1-√221,x=-1+√221

x(x-3)<3x(x+2)-2x²-3
x²-3x<3x²+3x-2x²-3
x²-3x6x>3
x>1/2