1道数学题!!!
abagof5apples,7bananas,and3carrotscosts$4.41,andabagof6apples,2bananas,and1carrotcost...
a bag of 5 apples, 7 bananas, and 3 carrots costs $4.41, and a bag of 6 apples, 2 bananas, and 1 carrot costs $2.37. at these same prices, how much should a bag of 3 apples, 17 bananas, and 7 carrots cost?
展开
3个回答
展开全部
let apple price =x, banana price=y, carrot price=z,
5x+7y+3z=4.41
6x+2y+z=2.37-->18x+6y+3z=7.11==>13x-y=2.7, y=13x-2.7
5x+7y+3z=4.41-->5x+51x-18.9+3z=4.41 -->56x+3z=23.31
6x+2y+z=2.37-->6x+26x-5.4+z=2.37-->32x+z=7.77-->96x+3z=23.31
40x=0, x=0, y=-2.7,z=7.77
3x+17y+7z=0-45.9+54.39=8.49
但因有单价为负,纵使算出来,答案应该写”无解”才洽当。
5x+7y+3z=4.41
6x+2y+z=2.37-->18x+6y+3z=7.11==>13x-y=2.7, y=13x-2.7
5x+7y+3z=4.41-->5x+51x-18.9+3z=4.41 -->56x+3z=23.31
6x+2y+z=2.37-->6x+26x-5.4+z=2.37-->32x+z=7.77-->96x+3z=23.31
40x=0, x=0, y=-2.7,z=7.77
3x+17y+7z=0-45.9+54.39=8.49
但因有单价为负,纵使算出来,答案应该写”无解”才洽当。
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询