一元二次不等式解集的数学题
一元二次不等式解集的数学题
求下列一元二次不等式的解集:
1.x²-4x+4<0
2.x²+x+6≤0
3.x(1-x)≤5
4.2x(x+1)+3≥0
5.x(x+2)+1≤4x
求下列一元二次不等式的解集:
1.x²-4x+4<0
2.x²+x+6≤0
3.x(1-x)≤5
4.2x(x+1)+3≥0
5.x(x+2)+1≤4x
数学人气:899 ℃时间:2019-12-01 11:52:22
优质解答
1.x²-4x+4<0(x-2)^2<0无解,即x∈空集2.x²+x+6≤0(x+1/2)^2+23/4≤0无解,即x∈空集3.x(1-x)≤5x-x^2≤5x^2-x+5≥0(x-1/2)^2+19/4≥0x属于任意实数,即x∈R4.2x(x+1)+3≥02(x^2+1)+3≥02(x+1/2)^2+5/2≥0x...
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