e: =>5/2x-3=3/10x15=45/10
=>5/2x=4,5+3=7,5
=>x=3
f:=>x-0,2=1,6
hay x=1,8
g: =>8,8x-50=51x0,4=20,4
=>8,8x=70,4
hay x=8
\(e,\left(\dfrac{5}{2}x-3\right):15=\dfrac{3}{10}\)
\(\dfrac{5}{2}x-3=\dfrac{3}{10}.15\)
\(\dfrac{5}{2}x-3=\dfrac{9}{2}\)
\(\dfrac{5}{2}x=\dfrac{9}{2}+3\)
\(\dfrac{5}{2}x=\dfrac{15}{2}\)
\(x=\dfrac{15}{2}:\dfrac{5}{2}\)
\(x=3\)
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\(f,1,6-\left(x-0,2\right)=0\)
\(x-0,2=1,6-0\)
\(x-0,2=1,6\)
\(x=1,6+0,2\)
\(x=1,8\)
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\(g,\left(8,8x-50\right):0,4=51\)
\(8,8x-50=51.0,4\)
\(8,8x-50=20,4\)
\(8,8x=20,4+50\)
\(8,8x=70,4\)
\(x=70,4:8,8\)
\(x=8\)
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\(h,\dfrac{6}{35}-\dfrac{5}{7}:\left(2x\right)=\dfrac{3}{4}\)
\(\dfrac{5}{7}:2x=\dfrac{6}{35}-\dfrac{3}{4}\)
\(\dfrac{5}{7}:2x=\dfrac{-81}{140}\)
\(2x=\dfrac{5}{7}:\dfrac{-81}{140}\)
\(2x=-\dfrac{100}{81}\)
\(x=-\dfrac{100}{81}:2\)
\(x=-\dfrac{50}{81}\)
