-1≤2x^2-2≤4
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-1≤2x^2-2≤4-1≤2x^2-2≤4-1≤2x^2-2≤4
-1≤2x^2-2≤4
-1≤2x^2-2≤4
-1≤2x^2-2≤4
解不等式(x^2+x+1)(x+3)^2(1-x)x(x+4)(x-4)^3≤0
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1-x/5≤x/15 3x-x+2/4>2x-5/6
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4道不等式.快.1.(x-1)(x-2)+(x-2)(x-3)-2(x-3)(x-4)≤-42.(x-6)(x-9)-(x-7)(x-1)>7(2x-5)3.(x-6)(x-9)-(x-7)(x+1)≤7(2x-5)4.x(x-3)
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x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
5x-1>2x-4,2分之1x≤4分之x+2
证明√(x^2+2x+4)-√(x^2-x+1)≤√3
-6x^2-x+2≤04x^2+4x+1<0
解不等式组:{x-3(x-2)≤4 三分之1+2x>x-1}
{2x+1>x-5,4x≤3x+2