Các câu hỏi tương tự
Làm được câu nào thì giúp mình với!!!1. Rút gọn: left(frac{y^2-yz-z^2}{x}+frac{x^2}{y+z}-frac{3}{frac{1}{y}+frac{1}{z}}right).frac{frac{2}{y}+frac{2}{z}}{frac{1}{yz}+frac{1}{xy}+frac{1}{xz}+left(x+y+zright)^2}2. Tính giá trị của biểu thức: Aleft(frac{m-n}{p}+frac{n-p}{m}+frac{p-m}{n}right)left(frac{p}{m-n}+frac{m}{n-p}+frac{n}{p-m}right)biết m+n+p0
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Làm được câu nào thì giúp mình với!!!
1. Rút gọn: \(\left(\frac{y^2-yz-z^2}{x}+\frac{x^2}{y+z}-\frac{3}{\frac{1}{y}+\frac{1}{z}}\right).\frac{\frac{2}{y}+\frac{2}{z}}{\frac{1}{yz}+\frac{1}{xy}+\frac{1}{xz}+\left(x+y+z\right)^2}\)
2. Tính giá trị của biểu thức:
\(A=\left(\frac{m-n}{p}+\frac{n-p}{m}+\frac{p-m}{n}\right)\left(\frac{p}{m-n}+\frac{m}{n-p}+\frac{n}{p-m}\right)\)biết \(m+n+p=0\)
Find the maximum value of \(M=\frac{x}{2x+y}+\frac{y}{2y+z}+\frac{z}{2z+x}\) , x,y,z > 0
\(x\) and \(y\) are positive number. Find the minimum value of \(A=\left(x+y\right)\left(\frac{1}{x}+\frac{1}{y}\right)\)
Cho x(m+n)=y(n+p)=z(p+m). Chứng minh \(\frac{m-n}{x\left(y-z\right)}=\frac{n-p}{y\left(z-x\right)}=\frac{p-m}{z\left(x-y\right)}\)
cho M=\(\frac{x^2}{\left(x+y\right)\left(1-y\right)}-\frac{y^2}{\left(x+y\right)\left(1+x\right)}-\frac{x^2y^2}{\left(1+x\right)\left(1-y\right)}\)
a ) Rút Gọn M
b ) Tìm x,y\(\in\)Z để M=-7
3 tháng 3 2017 lúc 20:04
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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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.
Viết chương trình :
a) nhập các số x,y,n,z:
b)kiểm tra xem các số x,y,n,z là số chẵn hay số lẻ.
c)tính S=1+4+7+...+n
d)tính A=\(\frac{x}{x+y}+\frac{x^2}{\left(x+y\right)^2}+\frac{x^3}{\left(x+y\right)^3}+...+\frac{x^n}{\left(x+y\right)^n}\)
Giúp mình nhé cần gấp!
Ai đúng mik t**k cho!!!
Cho \(x>0,y>0\)và m,n là hai số thực. Chứng minh rằng \(\frac{m^2}{x}+\frac{n^2}{y}\ge\frac{\left(m+n\right)^2}{x+y}\)
Cho: \(x\left(m+n\right)=y\left(n+p\right)=z\left(p+m\right)\)trong do x,y,z la cac so khac nhau va khac 0.
CMR: \(\frac{m-n}{x\left(y-z\right)}=\frac{n-p}{y\left(z-x\right)}=\frac{p-m}{z\left(x-y\right)}\)