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原題:已知關於x的一次函數y=(3a-7)x+a-2的影像與y軸交點在x軸的上方,且y隨x的增大而减小,求a的取值範圍 令x=0 y=a-2 根據題意 a-2>0 a>2 又因為y隨x的增大而减小 所以 3a-7
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