a) 3+2/3 b) 4- 8/5 + 2/10 c) 1/5 : 1/3 : 7/5 22/09/2021 Bởi Parker a) 3+2/3 b) 4- 8/5 + 2/10 c) 1/5 : 1/3 : 7/5
@gaukind2008 a) 3 + $\frac{2}{3}$ =$\frac{3}{1}$ + $\frac{2}{3}$ = $\frac{9}{3}$ + $\frac{2}{3}$ = $\frac{11}{3}$ b) 4 – $\frac{8}{5}$ + $\frac{2}{10}$ = 4 – $\frac{8}{5}$ + $\frac{1}{5}$ = 4 – ( $\frac{8}{5}$ + $\frac{1}{5}$ ) = 4- $\frac{7}{5}$ = $\frac{20}{5}$ – $\frac{7}{5}$ = $\frac{13}{5}$ c) $\frac{1}{5}$ ÷ $\frac{1}{3}$ ÷$\frac{7}{5}$ = $\frac{1}{5}$ × $\frac{3}{1}$ ÷ $\frac{5}{7}$ = $\frac{3}{5}$ ÷ $\frac{7}{5}$ = $\frac{3}{5}$ × $\frac{5}{7}$ = $\frac{3}{7}$ #Team FA Bình luận
`text{Giải thích các bước giải:}` $\rm a)\\3+\dfrac{2}{3}\\=\dfrac{9}{3}+\dfrac{2}{3}\\=\dfrac{9+2}{3}\\=\dfrac{11}{3}\\b)\\4-\dfrac{8}{5}+\dfrac{2}{10}\\=4-\dfrac{8}{5}+\dfrac{1}{5}\\=4-\left(\dfrac{8}{5}-\dfrac{1}{5}\right)\\=4-\dfrac{7}{5}\\=\dfrac{20}{5}-\dfrac{7}{5}\\=\dfrac{20-7}{5}\\=\dfrac{13}{5}\\c)\\\dfrac{1}{5}:\dfrac{1}{3}:\dfrac{7}{5}\\=\dfrac{1}{5}.\dfrac{3}{1}:\dfrac{7}{5}\\=\dfrac{3}{5}:\dfrac{7}{5}\\=\dfrac{3}{5}.\dfrac{5}{7}\\=\dfrac{3}{7}$ Bình luận
@gaukind2008
a) 3 + $\frac{2}{3}$
=$\frac{3}{1}$ + $\frac{2}{3}$
= $\frac{9}{3}$ + $\frac{2}{3}$
= $\frac{11}{3}$
b) 4 – $\frac{8}{5}$ + $\frac{2}{10}$
= 4 – $\frac{8}{5}$ + $\frac{1}{5}$
= 4 – ( $\frac{8}{5}$ + $\frac{1}{5}$ )
= 4- $\frac{7}{5}$
= $\frac{20}{5}$ – $\frac{7}{5}$
= $\frac{13}{5}$
c) $\frac{1}{5}$ ÷ $\frac{1}{3}$ ÷$\frac{7}{5}$
= $\frac{1}{5}$ × $\frac{3}{1}$ ÷ $\frac{5}{7}$
= $\frac{3}{5}$ ÷ $\frac{7}{5}$
= $\frac{3}{5}$ × $\frac{5}{7}$
= $\frac{3}{7}$
#Team FA
`text{Giải thích các bước giải:}`
$\rm a)\\3+\dfrac{2}{3}\\=\dfrac{9}{3}+\dfrac{2}{3}\\=\dfrac{9+2}{3}\\=\dfrac{11}{3}\\b)\\4-\dfrac{8}{5}+\dfrac{2}{10}\\=4-\dfrac{8}{5}+\dfrac{1}{5}\\=4-\left(\dfrac{8}{5}-\dfrac{1}{5}\right)\\=4-\dfrac{7}{5}\\=\dfrac{20}{5}-\dfrac{7}{5}\\=\dfrac{20-7}{5}\\=\dfrac{13}{5}\\c)\\\dfrac{1}{5}:\dfrac{1}{3}:\dfrac{7}{5}\\=\dfrac{1}{5}.\dfrac{3}{1}:\dfrac{7}{5}\\=\dfrac{3}{5}:\dfrac{7}{5}\\=\dfrac{3}{5}.\dfrac{5}{7}\\=\dfrac{3}{7}$