The charges for the usage of per m3 of water and per kWh of electricity are $1.94 and 26 cents respectively. In May, Mr Kumar used x m3 of water and y kWh of electricity and his bill came to $272.10. In June, his bill came to $202.60 for the usage of (x-5) m3 of water and (3y - 1950) kWh of electricity. Form two equations in x and y and solve these two equations to find the total cost of using (x+8) m3 of water and (2y-725) kWh of electricity.
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Khách
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3 tháng 3 2017
chào bạn còn nhớ mình ko bai nay o vong 15 luyen thi phai ko. Bạn phân tích từ số thành nhân tử
B=(a+b+c)(a^2 + b^2 + c^2 -ab-bc-ac)/a^2 +b^2 +c^2 -ab-bc-ac
suy ra B=a+b+c. suy ra B=2016
I do not know this because I was in grade 5 .
I was in grade 5 too.