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=58/7-(40/9+30/7)
=58/7-40/9-30/7
=(58/7-30/7)-40/9
==...................
k nha bn
\(a,\left(4\frac{1}{2}-\frac{2}{5}x\right):1\frac{3}{4}=\frac{11}{14}\)
\(\Rightarrow\left(\frac{9}{2}-\frac{2}{5}x\right):\frac{7}{4}=\frac{11}{4}\)
\(\Rightarrow\left(\frac{9}{2}-\frac{2}{5}x\right)=\frac{11}{4}\cdot\frac{7}{4}\)
\(\Rightarrow\left(\frac{9}{2}-\frac{2}{5}x\right)=\frac{77}{16}\)
\(\Rightarrow\frac{9}{2}-\frac{2}{5}x=\frac{77}{16}\)
\(\Rightarrow-\frac{2}{5}x=\frac{77}{16}-\frac{9}{2}\)
\(\Rightarrow-\frac{2}{5}x=\frac{5}{16}\)
\(\Rightarrow x=\frac{5}{16}:\left(-\frac{2}{5}\right)\)
\(\Rightarrow x=-\frac{25}{32}\)
\(b,\frac{2}{3}\cdot x-\frac{2}{5}x=\frac{9}{3}\)
\(\Rightarrow x\left(\frac{2}{3}-\frac{2}{5}\right)=\frac{8}{3}\)
\(\Rightarrow x\cdot\frac{4}{15}=\frac{8}{3}\)
\(\Rightarrow x=\frac{8}{3}:\frac{4}{15}\)
\(\Rightarrow x=10\)
\(c,\frac{-2}{3}|x|+1\frac{1}{2}=\frac{2}{5}\)
\(\Rightarrow\frac{-2}{3}|x|+\frac{3}{2}=\frac{2}{5}\)
\(\Rightarrow\frac{-2}{3}|x|=\frac{2}{5}-\frac{3}{2}\)
\(\Rightarrow\frac{-2}{3}|x|=-\frac{11}{10}\)
\(\Rightarrow|x|=\frac{-11}{10}:\frac{-2}{3}\)
\(\Rightarrow|x|=\frac{33}{20}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{33}{20}\\x=-\frac{33}{20}\end{cases}}\)
\(d,|2x-\frac{1}{3}|+\frac{1}{6}=\frac{3}{4}\)
\(\Rightarrow|2x-\frac{1}{3}|=\frac{3}{4}-\frac{1}{6}\)
\(\Rightarrow|2x-\frac{1}{3}|=\frac{7}{12}\)
\(\Rightarrow\orbr{\begin{cases}2x-\frac{1}{3}=\frac{7}{12}\\2x-\frac{1}{3}=-\frac{7}{12}\end{cases}\Rightarrow\orbr{\begin{cases}2x=\frac{11}{12}\\2x=-\frac{1}{4}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{11}{24}\\x=-\frac{1}{8}\end{cases}}}\)
\(\left(\frac{3}{8}+-\frac{3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
\(=\left(\frac{9}{24}+-\frac{18}{24}+\frac{14}{24}\right):\frac{5}{6}+\frac{1}{2}\)
\(=\frac{5}{24}:\frac{5}{6}+\frac{1}{2}\)
\(=\frac{5}{24}.\frac{6}{5}+\frac{1}{2}\)
\(=\frac{1}{4}+\frac{1}{2}\)
\(=\frac{1}{4}+\frac{2}{4}\)
\(=\frac{3}{4}\)
\(\frac{1}{2}+\frac{3}{4}-\left(\frac{3}{4}-\frac{4}{5}\right)\)
\(=\frac{1}{2}+\frac{3}{4}-\left(\frac{15}{20}-\frac{16}{20}\right)\)
\(=\frac{1}{2}+\frac{3}{4}-\frac{-1}{20}\)
\(=\frac{10}{20}+\frac{15}{20}-\frac{-1}{20}\)
\(=\frac{25}{20}-\frac{-1}{20}\)
\(=\frac{26}{20}\)
\(=\frac{13}{10}\)
\(\frac{\left(2^3\cdot5\cdot7\right)\cdot\left(5^2\cdot7^3\right)}{\left(2\cdot5\cdot7\right)^2}\)
\(=\frac{2^3\cdot5^3\cdot7^4}{2^2\cdot5^2\cdot7^2}\)
\(=2\cdot5\cdot7^2\)
\(=10\cdot49=490\)
\(\frac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7\right)^2}\)
\(=\frac{2^3.5^3.7^4}{2^2.5^2.7^2}\)
\(=2.5.7^2\)
\(=\left(2.5\right).7^2\)
\(=10.49\)
\(=490\)
\(=\left(\frac{5}{7}\cdot0,6-5:3\frac{1}{2}\right)\cdot\left(40\%-1,4\right)\left(-2\right)^3\)
\(=\left(\frac{5}{7}\cdot\frac{3}{5}-5:\frac{7}{2}\right)\left(\frac{2}{5}-\frac{1}{4}\right)\cdot\left(-8\right)\)
\(=\left(\frac{25}{21}-\frac{10}{7}\right)\cdot\frac{3}{20}\cdot\left(-8\right)\)
\(=-\frac{5}{21}\cdot\frac{3}{20}\cdot\left(-8\right)\)
\(=-\frac{2}{7}\)
Nhớ k nha các bạn gái làm vợ đi
\(B=\left(\frac{3}{7}-5:\frac{7}{2}\right).\left(\frac{2}{5}-1,4\right).\left(-8\right)\)
\(B=\left(\frac{3}{7}-\frac{35}{2}\right).\left(-1\right).\left(-8\right)\)
\(B=-\frac{239}{14}.\left(-1\right).\left(-8\right)\)
\(B=-\frac{956}{7}\)
Ps: Không làm quá chi tiết vì mất thời gian. Mà làm vậy là quá chi tiết so với bình thường tui làm rồi!
\(a,2\cdot3^3-3\cdot2^2+7^2-5^2\)
\(=2\cdot27-3\cdot4+49-25\)
\(=54-12+49-25\)
\(=42+24\)
\(=66\)
\(\left(3^6\div3^4\right).\left(2^7\div2^5\right)\)
\(=3^2.2^2\)
\(=9.4\)
\(=36\)
\(3^2.2^2\)
\(=\left(3.3\right).\left(2.3\right)\)
\(=\left(3.2\right).\left(3.2\right)\)
\(=6.6=36\)
Ai đồng ý tích nha
mik sẽ tích lại
\(=\left(3.3\right).\left(2.2\right)\)
\(=9.4\)
\(=36\)
mk bn bn cũng phải cho mk