Question

[MonkeyDace]

Giup mik giai bai toan nay,mik tick cho^_^

a,6/7+5/8:5-3/16(-2)²;b,2/3+1/3*(-2/3+5/6):2/3;c,1/1/2x-1/2=3/4;d,-3/5+(-2/5-99)

b,Tim x

a,(2/11+1/3)*x=(1/7-1/8)*56

*luu y:dau gach / la phan so,con so ma co hai dau nhu the nay:vd:7/1/7 la hon so nhe)

Answer 1

[Huỳnh Quang Sang]

\(a,\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}\cdot(-2)^2\)

\(=\frac{6}{7}+\frac{5}{8}:\frac{5}{1}-\frac{3}{16}\cdot4\)

\(=\frac{6}{7}+\frac{5}{8}\cdot\frac{1}{5}-\frac{3}{16}\cdot4\)

\(=\frac{6}{7}+\frac{1}{8}-\frac{3\cdot4}{16}\)

\(=\frac{6}{7}+\frac{1}{8}-\frac{3\cdot1}{4}\)

\(=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}=\frac{48+7-42}{56}=\frac{13}{56}\)

\(b,\frac{2}{3}+\frac{1}{3}\cdot\left[\frac{-2}{3}+\frac{5}{6}\right]:\frac{2}{3}\)

\(=\frac{2}{3}+\frac{1}{3}\cdot\left[\frac{-4+5}{6}\right]:\frac{2}{3}\)

\(=\frac{2}{3}+\frac{1}{3}\cdot\frac{1}{6}:\frac{2}{3}=\frac{2}{3}+\frac{1}{3}\cdot\frac{1}{6}\cdot\frac{3}{2}=\frac{2}{3}+\frac{1}{12}=\frac{8}{12}+\frac{1}{12}=\frac{9}{12}=\frac{3}{4}\)

c, Xem lại đề

d, \(\frac{-3}{5}+\left[\frac{-2}{5}-99\right]\)

\(=\frac{-3}{5}+\frac{-497}{5}=\frac{-500}{5}=-100\)

b, Tìm x

\(\left[\frac{2}{11}+\frac{1}{3}\right]\cdot x=\left[\frac{1}{7}-\frac{1}{8}\right]\cdot56\)

\(\Rightarrow\left[\frac{2}{11}+\frac{1}{3}\right]\cdot x=\left[\frac{8}{56}-\frac{7}{56}\right]\cdot56\)

\(\Rightarrow\left[\frac{6}{33}+\frac{11}{33}\right]\cdot x=1\)

\(\Rightarrow\frac{17}{33}\cdot x=1\)

\(\Rightarrow x=1:\frac{17}{33}=1\cdot\frac{33}{17}=\frac{33}{17}\)

Answer 2

[MonkeyDace]

thank ^_^