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(-5/4x+3,25)[3/5-(-5/2x)]=0
=>-5/4x+3,25 = 0 hoặc 3/5-(-5/2x)=0
=>+)-5/4x+3,25 = 0
=>-5/4x =-3,25
=>x= -2,6
+)3/5-(-5/2x)=0
=>3/5+5/2x=0
5/2x = -3/5
=> x= -0,24.
\(3,25.\left(-\frac{4}{3}\right)^2-1\frac{1}{3}.2005^0.\left|-2+\frac{2}{3}\right|\)
\(=\frac{13}{4}.\frac{16}{9}-\frac{4}{3}.1.\left|-\frac{4}{3}\right|\)
\(=\frac{13}{4}.\frac{16}{9}-\frac{4}{3}.1.\frac{4}{3}\)
\(=\frac{52}{9}-\frac{4}{3}.\frac{4}{3}\)
\(=\frac{52}{9}-\frac{16}{9}\)
\(=\frac{52-16}{9}\)
\(=\frac{36}{9}\)
\(=4.\)
\(\left(3,25-\frac{2}{3}x\right):\left(\frac{-7}{4}\right)=-3\)
\(\left(\frac{14}{3}-\frac{2}{3}x\right):\left(\frac{-7}{4}\right)=-3\)
\(\frac{14}{3}-\frac{2}{3}x=\left(-3\right).\left(\frac{-7}{4}\right)\)
\(\frac{14}{3}-\frac{2}{3}x=\frac{21}{4}\)
\(-\frac{2}{3}x=\frac{21}{4}-\frac{14}{3}\)
\(-\frac{2}{3}x=\frac{7}{12}\)
\(x=\frac{7}{12}:\left(-\frac{2}{3}\right)\)
\(x=-\frac{7}{8}\)
\(PT\Leftrightarrow3,25-\frac{2}{3}x=\left(-3\right).\left(\frac{-7}{4}\right)\)
\(\Leftrightarrow3,25-\frac{2}{3}x=\frac{21}{4}\)
\(\Leftrightarrow\frac{2}{3}x=3,25-\frac{21}{4}\)
\(\Leftrightarrow\frac{2}{3}x=-2\)
\(\Leftrightarrow x=\left(-2\right).\frac{3}{2}\)
\(\Leftrightarrow x=-3\)
\(x+\left(2+\frac{1}{3}\right).x-3,25.x=62,5\%\)
\(x.\left(1+2+\frac{1}{3}-3,25\right)=\frac{5}{8}\)
\(x.\frac{1}{12}=\frac{5}{8}\)
\(x=\frac{5}{8}:\frac{1}{12}\)
\(x=\frac{15}{2}\)
Chúc bn học tốt !!!!