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y1比y2大3,即:y1=y2+3 y1=2(3x+4),y2=5(2x-7), 2(3x+4)=5(2x-7)+3 6x+8=10x-35+3 8+35-3=(10-6)x 40=4x x=10 所以,當x為10時,y1比y2大3.
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