15.(-0,75) .0,8
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a; (15 - \(\dfrac{121}{18}\)) : \(\dfrac{297}{27}\) - \(\dfrac{17}{8}\) : \(\dfrac{51}{40}\)
(\(\dfrac{270}{18}\) - \(\dfrac{121}{18}\)) : \(\dfrac{297}{27}\) - \(\dfrac{17}{8}\) x \(\dfrac{40}{51}\)
= \(\dfrac{149}{18}\) : \(\dfrac{297}{27}\) - \(\dfrac{5}{3}\)
= \(\dfrac{149}{18}\) x \(\dfrac{27}{297}\) - \(\dfrac{5}{3}\)
= \(\dfrac{149}{198}\) - \(\dfrac{5}{3}\)
= \(\dfrac{149}{198}\) - \(\dfrac{330}{198}\)
= \(\dfrac{-181}{198}\)
b; (- 3,2) x (- \(\dfrac{15}{64}\)) + (0,8 - \(\dfrac{34}{15}\)): \(\dfrac{11}{3}\)
= (\(\dfrac{-16}{5}\)) x ( \(\dfrac{-15}{64}\)) + (\(\dfrac{4}{5}\) - \(\dfrac{34}{15}\)): \(\dfrac{11}{3}\)
= \(\dfrac{3}{4}\) + (\(\dfrac{4}{5}\) - \(\dfrac{34}{15}\)): \(\dfrac{11}{3}\)
= \(\dfrac{3}{4}\) + (\(\dfrac{12}{15}\) - \(\dfrac{34}{15}\)) : \(\dfrac{11}{3}\)
= \(\dfrac{3}{4}\) + \(\dfrac{-22}{15}\) : \(\dfrac{11}{3}\)
= \(\dfrac{3}{4}\) - \(\dfrac{22}{15}\) x \(\dfrac{3}{11}\)
= \(\dfrac{3}{4}\) - \(\dfrac{2}{5}\)
= \(\dfrac{15}{20}\) - \(\dfrac{8}{20}\)
= \(\dfrac{7}{20}\)
( x + 0,75 ) * ( 4 - 0,8 ) = 2005,8
( x + 0,75 ) * 3,2 = 2005,8
x + 0,75 = 2005,8 : 3,2
x+ 0,75 = 626,8125
x = 626,8125 - 0,75
x = 626,0625
tk ủng hộ mk nha các pn , ít điểm quá!
(x + 0,75) x (4 - 0,8) = 205,8
(x + 0,75) x 3,2 = 205,8
x + 0,75 = 205,8 : 3,2
x + 0,75 = 64,3125
x = 64,3125 - 0,75
x = 63,5625
đúng thì k mik nhé
( x + 0,75 ) x ( 4 - 0,8 ) = 205,8
=> ( x + 0,75 ) x 3,2 = 205,8
=> x + 0,75 = 205,8 : 3,2 = 64,3125
=> x = 64,3125 - 0,75
=> x = 63, 5625
=12*(-0,75)
=-9
* là gì v ạ ;((