d)
[tex]x-2\frac{2}{5} =3\frac{3}{10} /+2\frac{2}{5} \\x=3\frac{3}{10} +2\frac{4}{10} \\x=5\frac{7}{10}[/tex]
e)
[tex]5:x=10/*x\\10x=5\\x=\frac{1}{2}[/tex]
f)
[tex]x:\frac{10}{3} =20\\\frac{3x}{10} =20/*10\\3x=200\\x=\frac{200}{3} =66\frac{2}{3}[/tex]
2.
[tex]2a+1=8\\2a=7\\a=3\frac{1}{2} \\-\\5a=3\frac{3}{4} /*\frac{1}{5} \\a=\frac{3}{4} \\-\\a:6=1\frac{2}{3} /*6\\ a=10\\-\\1\frac{1}{4} +a=1\frac{3}{8}\\ a=\frac{1}{8} \\-\\a-2\frac{1}{4} =1\frac{1}{2} \\a=3\frac{3}{4} \\-\\12:a=\frac{3}{4} \\a=16[/tex]
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d)
[tex]x-2\frac{2}{5} =3\frac{3}{10} /+2\frac{2}{5} \\x=3\frac{3}{10} +2\frac{4}{10} \\x=5\frac{7}{10}[/tex]
e)
[tex]5:x=10/*x\\10x=5\\x=\frac{1}{2}[/tex]
f)
[tex]x:\frac{10}{3} =20\\\frac{3x}{10} =20/*10\\3x=200\\x=\frac{200}{3} =66\frac{2}{3}[/tex]
2.
[tex]2a+1=8\\2a=7\\a=3\frac{1}{2} \\-\\5a=3\frac{3}{4} /*\frac{1}{5} \\a=\frac{3}{4} \\-\\a:6=1\frac{2}{3} /*6\\ a=10\\-\\1\frac{1}{4} +a=1\frac{3}{8}\\ a=\frac{1}{8} \\-\\a-2\frac{1}{4} =1\frac{1}{2} \\a=3\frac{3}{4} \\-\\12:a=\frac{3}{4} \\a=16[/tex]