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Math!!!!英方程!!!!!

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1)4m+3分1=1又3分2-3分1m2)To use the internet service provided by company A,Mary has to pay $100 for installation fee , and the charge for unlimited internet connection is $150 per month.If she has paid $1 000 altogether,for how long has she used the internet service provided by company A?3)Donna has three types... 顯示更多 1)4m+3分1=1又3分2-3分1m 2)To use the internet service provided by company A,Mary has to pay $100 for installation fee , and the charge for unlimited internet connection is $150 per month.If she has paid $1 000 altogether,for how long has she used the internet service provided by company A? 3)Donna has three types of coins :$1 coins,$2 coins,$5 coins.The number of $1 coins is three times that of $2 coins. The number of $2 coins is 5 more than the number of $5 coins.The total value oF Donna's coins is $325.How many $2 coins does she have ? 4)Peter is 12 years old and his grandfather is 63 years old now. a)After how many years' time will Peter age be 4分1 of his grandfather age? b)How many years ago was grandfather's age 18 times Peter's? #全部都係方程,請列部X!!!!

最佳解答:

你好～～～ 以下答案只供參考，如有錯誤請多多指教～～ 另外，為方便看，所以我設全部的未知數為 y，以分開乘號(x)。 1)4m+3分1=1又3分2-3分1m Sol: 4m + 1/3 = 1又2/3 - 1(m)/3 4m + 1/3 = 5/3 - m/3 4m + m/3 = 5/3 - 1/3 13m/3 = 4/3 m = 4/3 x 3/13 m = 4/13 2)To use the internet service provided by company A,Mary has to pay $100 for installation fee , and the charge for unlimited internet connection is $150 per month.If she has paid $1 000 altogether,for how long has she used the internet service provided by company A? Sol: Let the number of month that she can use the service be y. 100 + 150y = 1000 150y = 900 y = 6 So, she can use half a year. 3)Donna has three types of coins :$1 coins,$2 coins,$5 coins.The number of $1 coins is three times that of $2 coins. The number of $2 coins is 5 more than the number of $5 coins.The total value oF Donna's coins is $325.How many $2 coins does she have ? Sol: Let the number of $2 coins she has be y. 1 x 3y + 2y + 5(y - 5) = 325 3y + 2y + 5y - 25 = 325 10y = 350 y = 35 So, she has 35 $2 coins. 4)Peter is 12 years old and his grandfather is 63 years old now. a)After how many years' time will Peter age be 4分1 of his grandfather age? Sol: Let the number of years be y. 12 + y = (63 + y) / 4 48 + 4y = 63 + y 3y = 63 - 48 y = 5 After 5 years, it will happen. b)How many years ago was grandfather's age 18 times Peter's? Sol: Let the number of years be y. 12 - y = (63 - y) / 18 216 - 18y = 63 - y 216 - 63 = 17y y = 9 So, 9 years ago, grandfather's age was 18 times of Peter's. 希望以上解答可以幫到你～～～～～

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