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\(a,50\%x-0,2+x=\dfrac{4}{5}\)
\(\Leftrightarrow\dfrac{1}{2}x-0,2+x=\dfrac{4}{5}\)
\(\Leftrightarrow\dfrac{1}{2}x+x=\dfrac{4}{5}+0,2\)
\(\Leftrightarrow\dfrac{3}{2}x=\dfrac{4}{5}+\dfrac{1}{5}\)
\(\Leftrightarrow\dfrac{3}{2}x=1\)
\(\Leftrightarrow x=\dfrac{2}{3}\)
\(b,\left(x-\dfrac{3}{4}\right):\dfrac{1}{2}+\dfrac{3}{2}=\dfrac{25}{2}\)
\(\Leftrightarrow\left(x-\dfrac{3}{4}\right).2=\dfrac{25}{2}-\dfrac{3}{2}\)
\(\Leftrightarrow\left(x-\dfrac{3}{4}\right).2=\dfrac{22}{2}\)
\(\Leftrightarrow x-\dfrac{3}{4}=11:2\)
\(\Leftrightarrow x=\dfrac{11}{2}+\dfrac{3}{4}\)
\(\Leftrightarrow x=\dfrac{25}{4}\)
\(\dfrac{12}{17}+\left(\dfrac{-6}{19}\right)+\dfrac{5}{17}+\left(\dfrac{-13}{19}\right)-\dfrac{1}{2}=\left(\dfrac{12}{17}+\dfrac{5}{17}\right)+\left(\dfrac{-6}{19}+\dfrac{-13}{19}\right)-\dfrac{1}{2}=1+\left(-1\right)-\dfrac{1}{2}=0-\dfrac{1}{2}=-\dfrac{1}{2}\)
\(=3\cdot25-27:9+25\cdot4-18:9=75-3+100-2=72+100-2=170\)
\(ab+a+b=2\\ a\left(b+1\right)+b+1=2+1\\ \left(a+1\right)\left(b+1\right)=3\)
Từ đó bạn xét các TH ra nhé!
X=1 ung ho nha