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標題:

數學題..............

發問:

1)4m=1/3=1又2/3-1/3m 2)Donna has three trpes of coins:$1coins ,$2 coins and $5 coins.The number of 1coins is three times of $2 coins . The number of $2 coins is 5 more than the number of $5coins.The total value of Donna's coins is $325. How many $2 coins does she have? 我要steps........唔該!!! 更新: 1)4m=1/3=1又2/3-1/3m 係...... 1)4m+1/3=1又2/3-1/3m ｓｏｒｒｙ！！！

最佳解答:

1)4m=1/3=1又2/3-1/3m 4m=1/3=5/3-m/3 4m=1/3=(5-m)/3 12m=1=5-m 所以12m=5-m m=5/12 這題可能錯架 2.)設Donna有$2x個， 3x+2x+5(x-5)=325 10x-25=325 10x=350 x=35 Donna有$235個

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1. don't know what are you saying 2.Let x be the no. of $5 coin, then no. of $2 coin = (x+5) no. of $1 coin = 3(x+5) 2(x+5)+3(x+5)+5[5x] = 325|||||1) 4m=1/3 4m=5/3-m/3 =>12m=1 12m=5-m =>m=1/12 m=5/11 then check the ans! LHS=RHS! 2) let 2coins =x , so 1coins =3x, 5coins =x-5 2x+3(1)x+(5)x-5 = 325 2x+3x+5x=330 10x=330 x=33 2006-10-16 19:40:14 補充： 佢show唔到... 個 > 係 ＞ 黎ga!8758B59A7FA1EEA7