tinh bằng cách thuật tiện nhất
\(\frac{1}{10}x\frac{2}{9}x\frac{3}{8}x\frac{4}{7}x\frac{5}{6}x\frac{6}{5}x\frac{7}{4}x\frac{8}{3}x\frac{9}{2}\)
Tìm x thỏa mãn \(\frac{x}{9}<\frac{x}{7}<\frac{x}{6}\).
Tìm x
\(a,x+\frac{15}{7}=\frac{9}{2}\)
\(b,x-\frac{3}{4}=\frac{7}{2}\)
\(c,x\times\frac{7}{8}=\frac{12}{5}\)
\(d,\frac{5}{6}:x=\frac{4}{3}\)
bài 1: tìm x:
a) \(x\cdot\frac{7}{9}=\frac{2}{3}+2\frac{1}{2}\) b) \(\frac{5}{7}+x:\frac{9}{4}=\frac{4}{3}\)
Tính giá trị các biểu thức sau một cách nhanh nhất:
a) 0.2 x 517 x 7 x 0.7 x 483 x 2
b) \(\frac{4}{9}+\frac{6}{11}+\frac{5}{9}+\frac{16}{11}+7\)
c) \(\frac{3}{5}+\frac{5}{1}+\frac{7}{13}+\frac{2}{5}+\frac{16}{11}+\frac{19}{13}\)
tìm x, biết: \(\frac{x-1}{5}+\frac{x-1}{7}+\frac{x-1}{9}+....+\frac{x-1}{35}+\frac{x-1}{37}=0\)
Bài 1 : Tính nhanh : a , \(\frac{4}{7}x\frac{5}{6}+\frac{3}{7}x\frac{5}{6}\) b , \(\frac{5}{9}x\frac{1}{4}+\frac{4}{9}x\frac{3}{12}\)
\(A=\left(6:\frac{3}{5}-1\frac{1}{6}x\frac{6}{7}\right):\left(4\frac{1}{5}x\frac{10}{11}+5\frac{2}{11}\right)\)\(B=\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{4}\right)x.......x\left(1-\frac{1}{2015}\right)x\left(1-\frac{1}{2016}\right)\)
\(C=5\frac{9}{10}:\frac{3}{2}-\left(2\frac{1}{3}x4\frac{1}{2}-2x2\frac{1}{3}\right):\frac{7}{4}\)
Tìm x : \(\frac{x-9}{x+7}\)= \(\frac{7}{9}\)