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1------2------3------1231152(1)y()x()(2)y=2x+15(x>0)y=2x+15(x>0)x(千克)0123456y(元)15171921232527y=2x+15(x>0)y3020352510155456780123xyxyx12260L4h20L(1)Q(L)t(h)(2)Q=-5t+60(0≤t≤12)x(千克)024681012y(元)6050403020100Q=-5t+60(0≤t≤12)Q604070502030108101214160246tQ=-5t+60(0≤t≤12)yxyx1yx2yx1(1)(2)x=0-3y(3)y=03x3142-2-101234-4-3-2-1xy3142-2-101234-4-3-2-1xy(4)xy(5)xy3142-2-101234-4-3-2-1xy(6)yxx(7)yxx120cm5cmh(cm)t()ABCDhto204hto204hto204hto204S(米)t(秒)12.512o100乙甲oy(米)X(分)2040900Aoy(米)X(分)2040900Coy(米)X(分)2040900Boy(米)X(分)2040900D2(1)(2)xy>0(3)xy<03142-2-101234-4-3-2-1xy121yx2yx