1 Thực hiện phép tính :a)\(2\frac{1}{5}.\frac{25}{4}-10\frac{1}{5}.\frac{24}{5}\)b)\(5.(\frac{-2}{5})^2+2.\left(\frac{-2}{5}\right)+4.\left(\frac{-2}{5}\right)^0\)c)\(\sqrt{\frac{16}{9}+}\left(\frac{2}{3}\right)^9:\left(\frac{-2}{3}\right)^8-/-2020/\)2. tìm x,y,z biết :a)\(\backslash-2x+\frac{1}{3}\backslash-\frac{1}{3}=2\frac{2}{3}\)b) \(\frac{x-1}{x-5}=\frac{6}{7}\)c) 2x=3y=5z và...
Đọc tiếp
1 Thực hiện phép tính :
a)\(2\frac{1}{5}.\frac{25}{4}-10\frac{1}{5}.\frac{24}{5}\)
b)\(5.(\frac{-2}{5})^2+2.\left(\frac{-2}{5}\right)+4.\left(\frac{-2}{5}\right)^0\)
c)\(\sqrt{\frac{16}{9}+}\left(\frac{2}{3}\right)^9:\left(\frac{-2}{3}\right)^8-/-2020/\)
2. tìm x,y,z biết :
a)\(\backslash-2x+\frac{1}{3}\backslash-\frac{1}{3}=2\frac{2}{3}\)
b) \(\frac{x-1}{x-5}=\frac{6}{7}\)
c) 2x=3y=5z và x+y-z=95
