已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-3
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已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-3已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-3已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-31.y1
已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-3
已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-3
已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-3
1.y1=6-x,y2=2+7x ,y1=y2-3
6-x=2+7x-3 => 8x=7 => x= 7/8
即:y2-y1=-3
2+7x-6+x=-3
8x=1
x=1/8
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