Toán tính thuận tiện 1/10 +2/9+3/8+4/7 + 5/6+1/6+ 3/7+5/8+9/10 06/10/2021 By Liliana tính thuận tiện 1/10 +2/9+3/8+4/7 + 5/6+1/6+ 3/7+5/8+9/10
Đáp án: `=38/9` Giải thích các bước giải: `1/10 +2/9+3/8+4/7 + 5/6+1/6+ 3/7+5/8+9/10` `=(1/10+9/10)+2/9+(3/8+5/8)+(4/7+3/7)+(5/6+1/6)` `=10/10+2/9+8/8+7/7+6/6` `=1+2/9+1+1+1` `=4+2/9=38/9` Trả lời
$\frac{1}{10}$ + $\frac{2}{9}$ + $\frac{3}{8}$ + $\frac{4}{7}$ +$\frac{5}{6}$ + $\frac{1}{6}$ + $\frac{3}{7}$ + $\frac{5}{8}$ +$\frac{7}{9}$ $\frac{9}{10}$ = ($\frac{1}{10}$ + $\frac{9}{10}$) + ($\frac{3}{8}$ + $\frac{5}{8}$) + ($\frac{4}{7}$ +$\frac{3}{7}$) +( $\frac{2}{9}$ + $\frac{7}{9}$) + ($\frac{1}{6}$ + $\frac{5}{6}$) = 1 + 1 + 1 + 1 +1= 5. ÒωÓ xin hay nhất Trả lời
Đáp án: `=38/9`
Giải thích các bước giải:
`1/10 +2/9+3/8+4/7 + 5/6+1/6+ 3/7+5/8+9/10`
`=(1/10+9/10)+2/9+(3/8+5/8)+(4/7+3/7)+(5/6+1/6)`
`=10/10+2/9+8/8+7/7+6/6`
`=1+2/9+1+1+1`
`=4+2/9=38/9`
$\frac{1}{10}$ + $\frac{2}{9}$ + $\frac{3}{8}$ + $\frac{4}{7}$ +$\frac{5}{6}$ + $\frac{1}{6}$ + $\frac{3}{7}$ + $\frac{5}{8}$ +$\frac{7}{9}$ $\frac{9}{10}$
= ($\frac{1}{10}$ + $\frac{9}{10}$) + ($\frac{3}{8}$ + $\frac{5}{8}$) + ($\frac{4}{7}$ +$\frac{3}{7}$) +( $\frac{2}{9}$ + $\frac{7}{9}$) + ($\frac{1}{6}$ + $\frac{5}{6}$)
= 1 + 1 + 1 + 1 +1= 5.
ÒωÓ xin hay nhất