求一元二次不等式x²+2x≥0的解集
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求一元二次不等式x²+2x≥0的解集
求一元二次不等式x²+2x≥0的解集
求一元二次不等式x²+2x≥0的解集
x(x+2)≥0
x(x+2)>=0
x>=0或x<=-2
x²+2x≥0
x(x+2)≥0
x≥0,
x+2≥0
x≥-2
x^2+2x>=0 x(x+2)>=0 x>=0或 x<=-2
一元二次不等式x²+2x≥0的解集为(-无穷,-2)∪[0,+无穷)