Đáp án:
Bài 10:
`a`) `x` `+` `2``\frac{2}{3}` = `5``\frac{2}{3}`
`x` `+` `\frac{8}{3}` = `\frac{17}{3}`
`x` = `\frac{17}{3}` `-` `\frac{8}{3}`
`x` = `\frac{9}{3}` = `3`
`b`) `x` `-` `1``\frac{4}{5}` = `3``\frac{2}{7}`
`x` `-``\frac{9}{5}` = `\frac{23}{7}`
`x` = `\frac{23}{7}` `+` `\frac{9}{5}`
`x` = `\frac{178}{35}`
`c`) `x` `×` `3``\frac{1}{2}` = `4``\frac{3}{4}`
`x` `×` `\frac{7}{2}` =`\frac{19}{4}`
`x` = `\frac{19}{4}` : `\frac{7}{2}`
`x` = `\frac{19}{14}`
`d`) `x` `:` `2``\frac{2}{3}` = `4``\frac{1}{3}`
`x` `:` `\frac{8}{3}` = `\frac{13}{3}`
`x` = `\frac{13}{3}``×` `\frac{8}{3}`
`x` = `\frac{104}{9}`
Bài 11: (lỡ tay làm nên làm nốt)
`a`) `x` `-` `\frac{3}{4}` = `6``×``\frac{3}{8}`
`x` `-` `\frac{3}{4}` = `\frac{9}{4}`
`x` = `\frac{9}{4}``+` `\frac{3}{4}`
`x` = `\frac{12}{4}` = `3`
`b`) `\frac{7}{8}` `:` `x` = `3``-``\frac{1}{2}`
`\frac{7}{8}` `:` `x` = `\frac{5}{2}`
`x` = `\frac{7}{8}` `:` `\frac{5}{2}`
`x` = `\frac{7}{20}`
