不等式(2x-1)^2-(1-3x)^2<5(1-x)(x+1)的解集是什么

2025-01-05 00:32:51
推荐回答(2个)
回答1:

(2x-1)^2-(1-3x)^2<5(1-x)(x+1)
4x²-4x+1-9x²+6x-1<5-5x²
2x<5
x<5/2

回答2:

(2x-1)^2-(1-3x)^2<5(1-x)(x+1)
[(2x-1)-(1-3x)][(2x-1)+(1-3x)]<5(1-x)(x+1)
(2x-1-1+3x)(2x-1+1-3x)<5(1-x)(x+1)
-x(5x-2)<5(1-x^2)
-5x^2+2x<5-5x^2
2x<5
x<5/2