Tìm x biết:
a/ (152\(\frac{2}{4}\) - 148\(\frac{3}{8}\)) : 0,2= x:0,3
b/ (85\(\frac{7}{30}\) -83\(\frac{5}{18}\) ) : 2\(\frac{2}{3}\) = 0,01.x:4
c/ \(\frac{x-1}{x+5}=\frac{6}{7}\)
d/ \(\frac{x}{19}=\frac{y}{21}và2x-y=34\)
e/ \(\frac{x}{15}=\frac{y}{20}=\frac{z}{28}và3x+2y-2z=186\)
Loga
Toán lớp 10
