解不等式组{3(x+1)>5x-1,[ (5x+1)/2]-[(2x-1)/3]>=-1}解不等式;-1/3(x-1)>4+2x
问题描述:
解不等式组{3(x+1)>5x-1,[ (5x+1)/2]-[(2x-1)/3]>=-1}
解不等式;-1/3(x-1)>4+2x
答
1 .3x+3>5x-1得x2. 15x+3-4x+2>=-6得x>=-11/19
∴x
;-1/3(x-1)>4+2x
4+2x+1/3(x-1)(6x²+6x-11)/3(x-1)即(6x²+6x-11)(x-1)∴x
答
3(x+1)>5x-1 3x+3>5x-1 4>2x x=-1 左右乘以6 15x+3-4x+2>=-6 11x>=-11 x>=-1 得 -1=1 则有-1/3>(4+2x)(x-1) -1/3>4x+2x^2-4 2x^2+4x-11/3 1 组合得出结果 同理假设x...