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a; 0,2.\(\dfrac{15}{36}\) - (\(\dfrac{2}{5}\) + \(\dfrac{2}{3}\)): 1%
= \(\dfrac{1}{12}\) - \(\dfrac{16}{15}\): \(\dfrac{1}{100}\)
= \(\dfrac{1}{12}\) - \(\dfrac{320}{3}\)
= \(\dfrac{1}{12}\) - \(\dfrac{1280}{12}\)
= - \(\dfrac{1279}{12}\)
b; 75% - 1\(\dfrac{1}{2}\) + 0,5 : \(\dfrac{5}{12}\)
= 0,75 - 1,5 + 1,2
= -0,75 + 1,2
= 0,45
c; 1\(\dfrac{3}{15}.0,75-\left(\dfrac{8}{15}+0,25\right)\).\(\dfrac{24}{47}\)
= \(\dfrac{28}{15}\).0,75 - \(\dfrac{47}{60}\).\(\dfrac{24}{47}\)
= \(\dfrac{7}{5}-\dfrac{2}{5}\)
= 1
d; \(\dfrac{32}{15}\): (-1\(\dfrac{1}{5}\) + 1\(\dfrac{1}{3}\))
= \(\dfrac{32}{15}\): (-\(\dfrac{6}{5}\) + \(\dfrac{4}{3}\))
= \(\dfrac{32}{15}\): \(\dfrac{2}{15}\)
= 16
a; \(\dfrac{3}{5}\) - \(\dfrac{-7}{10}\) - \(\dfrac{13}{-20}\)
= \(\dfrac{12}{20}\) + \(\dfrac{14}{20}\) + \(\dfrac{13}{20}\)
= \(\dfrac{39}{20}\)
b; \(\dfrac{1}{2}\) + \(\dfrac{1}{-3}\) + \(\dfrac{1}{4}\) - \(\dfrac{-1}{6}\)
= \(\dfrac{6}{12}\) - \(\dfrac{4}{12}\) + \(\dfrac{3}{12}\) + \(\dfrac{2}{12}\)
= \(\dfrac{7}{12}\)
cau 1:8/45:8/9-2/5.x=8/45*9/8-2/5.x=8.9/45.8-2/5.x=1/5-2/5.x=2/-3. =>2/5.x=1/5-2/-3=3/15+2/3=3/15+10/15=13/15. =>x=13/15:2/5=13/15.5/2=13.5/15.2=13/6. Vậy x = 13/6. k nha co j ket ban
8/45 : 8/9 - 2/5 . X = 2/-3
8/45 . 9/8 - 2/5 . X = -2/3
1/5 - 2/5 . X = -2/3
-1/5 . X = -2/3
X = -2/3 : -1/5
X = -2/3 x 5/-1 = 10/3
=> x = 10/3
tk ủng hộ nhé !
nếu có sai nhờ anh/ chị / bạn sửa giùm em ạ !!!!!
\(\frac{1}{2}+-\frac{1}{5}+-\frac{5}{7}+\frac{1}{6}-\frac{3}{35}+\frac{1}{3}+\frac{1}{41}=\frac{1}{41}\)
a ) \(-\frac{3}{7}.\frac{3}{11}+-\frac{3}{7}.\frac{8}{11}+1\frac{3}{7}\)
\(=-\frac{3}{7}.\left(\frac{3}{11}+\frac{8}{11}\right)+\frac{10}{7}\)
\(=-\frac{3}{7}.\frac{11}{11}+\frac{10}{7}\)
\(=-\frac{3}{7}.1+\frac{10}{7}\)
\(=\frac{10}{7}\)
b ) \(75\%.10,5=\frac{3}{4}.10,5=7,875\)
c ) \(5-3.\left(\left|-4\right|-30:15\right)\)
\(=5-3.\left(4-2\right)\)
\(=5-3.2\)
\(=5-6\)
\(=-1\)
d ) \(-\frac{5}{7}.\frac{2}{11}+-\frac{5}{7}.\frac{9}{11}+1\frac{5}{7}\)
\(=-\frac{5}{7}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{12}{7}\)
\(=-\frac{5}{7}.1+\frac{12}{7}\)
\(=\frac{7}{7}\)
\(=1\)
Chúc bạn học tốt !!!
có phải đề là:
\(\frac{1}{2}\)+\(\frac{2}{3}\)+\(\frac{3}{4}\)+\(\frac{4}{5}\)+\(\frac{3.99}{100}\)không bạn
dễ, nhưng phai giai dc câu nay 60% nhan x cong 2 phan 3 = 1 phan 3 nhan 6va 1 phan 3
\(\frac{4}{7}-\frac{2}{15}\div\frac{4}{25}\)
\(=\frac{4}{7}-\frac{2}{15}\times\frac{25}{4}\)
\(=\frac{4}{7}-\frac{50}{60}\)
\(=\frac{4}{7}-\frac{5}{6}\)
\(=\frac{24}{42}-\frac{35}{42}\)
\(=-\frac{11}{42}\)
\(x+\dfrac{5}{6}\cdot2\%-\dfrac{1}{4}=35\%\\ x+\dfrac{5}{6}\cdot\dfrac{1}{50}-\dfrac{1}{4}=\dfrac{7}{20}\\ x+\dfrac{1}{60}-\dfrac{1}{4}=\dfrac{7}{20}\\ x+\dfrac{1}{60}-\dfrac{15}{60}=\dfrac{7}{20}\\ x-\dfrac{14}{60}=\dfrac{7}{20}\\ x-\dfrac{7}{30}=\dfrac{7}{20}\\ x=\dfrac{7}{20}+\dfrac{7}{30}\\ x=\dfrac{21}{60}+\dfrac{14}{60}\\ x=\dfrac{35}{60}\\ x=\dfrac{7}{12}\)
bạn ơi caau hoir hơn khó hiểu nha
có phải là : x+\(\dfrac{5}{6}\) nhân \(\dfrac{2}{5}\) - \(\dfrac{1}{4}\) không ạ