三个班向灾区捐款,1班捐款钱数是2,3班3/4,2班捐款钱数是1.3班2/5.3班捐款99元,3个班共捐款多少?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/25 17:11:56
![三个班向灾区捐款,1班捐款钱数是2,3班3/4,2班捐款钱数是1.3班2/5.3班捐款99元,3个班共捐款多少?](/uploads/image/z/3954755-11-5.jpg?t=%E4%B8%89%E4%B8%AA%E7%8F%AD%E5%90%91%E7%81%BE%E5%8C%BA%E6%8D%90%E6%AC%BE%2C1%E7%8F%AD%E6%8D%90%E6%AC%BE%E9%92%B1%E6%95%B0%E6%98%AF2%2C3%E7%8F%AD3%2F4%2C2%E7%8F%AD%E6%8D%90%E6%AC%BE%E9%92%B1%E6%95%B0%E6%98%AF1.3%E7%8F%AD2%2F5.3%E7%8F%AD%E6%8D%90%E6%AC%BE99%E5%85%83%2C3%E4%B8%AA%E7%8F%AD%E5%85%B1%E6%8D%90%E6%AC%BE%E5%A4%9A%E5%B0%91%3F)
三个班向灾区捐款,1班捐款钱数是2,3班3/4,2班捐款钱数是1.3班2/5.3班捐款99元,3个班共捐款多少?
三个班向灾区捐款,1班捐款钱数是2,3班3/4,2班捐款钱数是1.3班2/5.3班捐款99元,3个班共捐款多少?
三个班向灾区捐款,1班捐款钱数是2,3班3/4,2班捐款钱数是1.3班2/5.3班捐款99元,3个班共捐款多少?
设1班捐A,2班捐B,3班捐C,
则A = 3/4(B+C) B=2/5(A+C)
3/4A+A=3/4(A+B+C) 推出A占总的3/7
2/5B+B=2/5(A+B+C) 推出B占总的2/7
所以C即3班占总的2/7 为99元 所以总的为99*7/2=346.5元