甲乙丙三货,购甲3件,乙4件,丙2件需31元;甲5件,乙6件,丙1件需45元,甲1件,乙2件,丙3件,需几元?请写算式!
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/05 12:45:43
![甲乙丙三货,购甲3件,乙4件,丙2件需31元;甲5件,乙6件,丙1件需45元,甲1件,乙2件,丙3件,需几元?请写算式!](/uploads/image/z/7866350-62-0.jpg?t=%E7%94%B2%E4%B9%99%E4%B8%99%E4%B8%89%E8%B4%A7%2C%E8%B4%AD%E7%94%B23%E4%BB%B6%2C%E4%B9%994%E4%BB%B6%2C%E4%B8%992%E4%BB%B6%E9%9C%8031%E5%85%83%EF%BC%9B%E7%94%B25%E4%BB%B6%2C%E4%B9%996%E4%BB%B6%2C%E4%B8%991%E4%BB%B6%E9%9C%8045%E5%85%83%2C%E7%94%B21%E4%BB%B6%2C%E4%B9%992%E4%BB%B6%2C%E4%B8%993%E4%BB%B6%2C%E9%9C%80%E5%87%A0%E5%85%83%3F%E8%AF%B7%E5%86%99%E7%AE%97%E5%BC%8F%21)
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甲乙丙三货,购甲3件,乙4件,丙2件需31元;甲5件,乙6件,丙1件需45元,甲1件,乙2件,丙3件,需几元?请写算式!
甲乙丙三货,购甲3件,乙4件,丙2件需31元;甲5件,乙6件,丙1件需45元,甲1件,乙2件,丙3件,需几元?
请写算式!
甲乙丙三货,购甲3件,乙4件,丙2件需31元;甲5件,乙6件,丙1件需45元,甲1件,乙2件,丙3件,需几元?请写算式!
设甲、乙、丙每件分别需X,Y,Z元信则可得
3X+4Y+2Z=31……!
5X+6Y+Z=45……!
令X+2Y+3Z=T……!
!+!得8x+10y+3z=76……!
2*!-!得10x+12y-3x-4y=90-31即7x+8y=59
由!-!得T+7X+8Y=76
故T=76-59=17元