2017-02-21 21:25:09qztwqg6
中一升中二數學(英文)
標題:
中一升中二數學(英文)
A bag contains 200 coins. The total value of these coins is $400.If there are m $5coins and all the others are 20￠ coins (a)Find the value of m, (b)find the number of 20￠coins 唔該幫幫手,完全唔知點做
最佳解答:
(a) 5m+0.2(200-m) = 400 5m+40-0.2m = 400 4.8m = 360 m=75 20￠(仙)=2毫=0.2元,先要化作相同單位 m是$5coins 的數量,因為全部有200 coins, 所以剩下的,即(200-m)是20￠ coins 的數量 而全部總值就是$400. (b)根據上面m=75 (有75個$5coins ) 所以the number of 20￠coins =200-75 =125個
其他解答:8FFC68D9745AD588
中一升中二數學(英文)
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發問:A bag contains 200 coins. The total value of these coins is $400.If there are m $5coins and all the others are 20￠ coins (a)Find the value of m, (b)find the number of 20￠coins 唔該幫幫手,完全唔知點做
最佳解答:
(a) 5m+0.2(200-m) = 400 5m+40-0.2m = 400 4.8m = 360 m=75 20￠(仙)=2毫=0.2元,先要化作相同單位 m是$5coins 的數量,因為全部有200 coins, 所以剩下的,即(200-m)是20￠ coins 的數量 而全部總值就是$400. (b)根據上面m=75 (有75個$5coins ) 所以the number of 20￠coins =200-75 =125個
其他解答:8FFC68D9745AD588