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a; \(\dfrac{93}{17}\): \(x\) + (- \(\dfrac{21}{17}\)) : \(x\) + \(\dfrac{22}{7}\): \(\dfrac{22}{3}\) = \(\dfrac{5}{14}\)
\(\dfrac{94}{17}\) \(\times\) \(\dfrac{1}{x}\) - \(\dfrac{21}{17}\) \(\times\) \(\dfrac{1}{x}\) + \(\dfrac{3}{7}\) = \(\dfrac{5}{14}\)
\(\dfrac{72}{17}\) \(\times\) \(\dfrac{1}{x}\) + \(\dfrac{3}{7}\) = \(\dfrac{5}{14}\)
\(\dfrac{72}{17x}\) = \(\dfrac{5}{14}\) - \(\dfrac{3}{7}\)
\(\dfrac{72}{17x}\) = - \(\dfrac{1}{14}\)
17\(x\) = 72.(-14)
17\(x\) = - 1008
\(x\) = - 1008 : 17
\(x\) = - \(\dfrac{1008}{17}\)
Vậy \(x\) \(=-\dfrac{1008}{17}\)
b; - \(\dfrac{32}{27}\) - (3\(x\) - \(\dfrac{7}{9}\))3 = - \(\dfrac{24}{27}\)
- \(\dfrac{32}{27}\) + \(\dfrac{24}{27}\) = (3\(x\) - \(\dfrac{7}{9}\))3
(3\(x-\dfrac{7}{9}\))3 = - \(\dfrac{8}{27}\)
(3\(x-\dfrac{7}{9}\))3 = (- \(\dfrac{2}{3}\))3
3\(x-\dfrac{7}{9}\) = - \(\dfrac{2}{3}\)
3\(x\) = - \(\dfrac{2}{3}\) + \(\dfrac{7}{9}\)
3\(x\) = \(\dfrac{1}{9}\)
\(x\) = \(\dfrac{1}{9}\) : 3
\(x\) = \(\dfrac{1}{27}\)
Vậy \(x=\dfrac{1}{27}\)
\(-\frac{5}{16}:0,125+1,456:\frac{7}{25}-4\frac{1}{2}\cdot0,8\)
= \(-2,5+5,2-3,6\)
= -0,9
sao cậu không tính bằng máy tính?
là \(\frac{113}{10}\)
tk nhé!
5 / 16 :0 , 125 + 1 , 456 : 7 / 25 + 4 1/2 . 0 , 8
= 5 / 16 : 1 / 8 + 1,456 : 7 / 25 + 9 / 2 . 4 / 5
= 5 / 2 + 26 / 5 + 18 / 5
= 113 / 10
\(\frac{5}{16}:0,125+1,456:\frac{7}{25}+\frac{9}{2}.0,8\)
\(=\frac{5}{16}:\frac{125}{1000}+\frac{1456}{1000}:\frac{7}{25}+\frac{9}{2}.\frac{8}{10}\)
\(=\frac{5}{16}.\frac{1000}{125}+\frac{1456}{1000}.\frac{25}{7}+\frac{18}{5}\)
\(=\frac{5}{2}+\frac{26}{5}+\frac{18}{5}\)
\(=\frac{25}{10}+\frac{52}{10}+\frac{36}{10}\)
\(=\frac{25+52+36}{10}=\frac{113}{10}\)
(\(\frac{5}{16}\) : 0,125 ) + ( 1,456 : \(\frac{7}{25}\) ) +( \(\frac{9}{2}\) x 0,8 )
= 2,5 + 5,2 + 3,6
= 7,7 + 3,6
= 11,3
Bạn có thể cho mik các bước ko LovE _ Khánh Ly _ LovE ?
0,15 m3 = 150 dm3 = 150 000 lít
280 c.c = 0,28 dm3 = 0,28 lít
0,65 lít = 0,65 dm3 = 650 cm3
580ml = 0,58 lít = 0,58 dm3
Chúc bạn học tốt!
Thân!
\(=6\frac{281}{640}\)