$1)1,4.\frac{15}{49}-($ $\frac{4}{5}+$ $\frac{2}{3}):2$ $\frac{1}{5}$ $2)(\frac{-2}{3}+1$ $\frac{1}{4}-$ $\frac{1}{6}).$ $\frac{-24}{10}:0,5$ $3)1\frac{2}{3}+[0,25:(10,3-9,8)-$ $\frac{3}{4}]$ $4)(\frac{5}{7}.0,6-5:3$ $\frac{1}{2}).(40phần trăm-1,4).(-2)³$ $5)B=\frac{13}{15}.0,25.3+($ $\frac{8}{15}-1$ $\frac{19}{60}):1$ $\frac{23}{24}$ $6)\frac{1}{2}x+$ $\frac{3}{5}(x-2)=3$ $7)\frac{1}{3}x-0,5x=0,75$ $8)(2,4x-36):1\frac{5}{7}=-1$ $9)(\frac{3}{4}x+2$ $\frac{1}{2}).$ $\frac{-2}{3}=$ $\frac{1}{8}$ $10)(3\frac{1}{2}+2x)2$ $\frac{2}{3}=5$ $\frac{1}{3}$ $11)3\frac{1}{3}x+16$ $\frac{3}{4}=-13,25$

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