A={y|y=x^2-2x+3},B={y|y=2x^2-3x+2} 则A和B的交集等于?
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A={y|y=x^2-2x+3},B={y|y=2x^2-3x+2}则A和B的交集等于?A={y|y=x^2-2x+3},B={y|y=2x^2-3x+2}则A和B的交集等于?A={y|y=x^2-2
A={y|y=x^2-2x+3},B={y|y=2x^2-3x+2} 则A和B的交集等于?
A={y|y=x^2-2x+3},B={y|y=2x^2-3x+2} 则A和B的交集等于?
A={y|y=x^2-2x+3},B={y|y=2x^2-3x+2} 则A和B的交集等于?
x²-2x+3=(x-1)²+2≥2
所以A={Y|Y≥2 }
2x²-3x+2=2(x-3/4)²+7/8≥7/8
所以B={y|y≥7/8}
所以A∩B=【2,+无穷)
两个表示值域的交集,a中x大于等于2,b中x大于等于8分之7,两个取交集
A={y|y=x^2-2x+3}
y=(x-1)²+2≥2
A=[2, ∝)
B={y|y=2x^2-3x+2}
y=2(x-3/4)²-7/8
B=[-7/8, ∝)
A和B的交集=[2, ∝)
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