mọi người tính hộ em phép tính này với ạ:
(\(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\)). (\(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\))
Tính nhanh:
a) \(2.\dfrac{3}{7}+\left(\dfrac{2}{9}-1\dfrac{3}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)
b) \(\dfrac{-11}{23}.\dfrac{6}{7}+\dfrac{8}{7}.\dfrac{-11}{23}-\dfrac{1}{23}\)
c) \(\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\right)\)
d) \(19\dfrac{5}{8}:\dfrac{7}{12}-15\dfrac{1}{4}:\dfrac{7}{12}\)
e) \(\dfrac{2}{5}.\dfrac{1}{3}-\dfrac{2}{15}:\dfrac{1}{5}+\dfrac{3}{5}.\dfrac{1}{3}\)
Tính nhanh
a) \(\dfrac{-3}{7}+\dfrac{15}{26}-\left(\dfrac{2}{13}-\dfrac{3}{7}\right)\)
b) \(2.\dfrac{3}{7}+\left(\dfrac{2}{9}-1\dfrac{3}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)
c) \(\dfrac{-11}{23}.\dfrac{6}{7}+\dfrac{8}{7}.\dfrac{-11}{23}-\dfrac{1}{23}\)
d) \(\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\right)\)
a) \(\dfrac{-3}{7}+\dfrac{15}{26}-\left(\dfrac{2}{13}-\dfrac{3}{7}\right)\\ =\dfrac{-3}{7}+\dfrac{15}{26}-\dfrac{2}{13}+\dfrac{3}{7}\\ =\left(\dfrac{-3}{7}+\dfrac{3}{7}\right)+\left(\dfrac{15}{26}-\dfrac{2}{13}\right)\\ =0+\left(\dfrac{15}{26}-\dfrac{4}{26}\right)\\ =0+\dfrac{11}{26}\\ =\dfrac{11}{26}\)
\(c)\dfrac{-11}{23}.\dfrac{6}{7}+\dfrac{8}{7}.\dfrac{-11}{23}-\dfrac{1}{23}\\=\dfrac{-1}{23}\left ( \dfrac{66}{7}+\dfrac{88}{7}+1 \right )\\ =\dfrac{-1}{23}.23=-1\)
(377/-231- 123/89 + 34/791) x 1/6 - 1/8 - 1/24. Tính nhanh hộ mình với ạ
\(=\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right)\cdot\left(\dfrac{4}{24}-\dfrac{3}{24}-\dfrac{1}{24}\right)=0\)
tính nhanh
2155-(174+2155)+(-68+174)
2.\(\dfrac{3}{7}\left(\dfrac{2}{9}-1\dfrac{3}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)
\(\left(1-\dfrac{1}{2}\right)\left(1-\dfrac{1}{3}\right)\left(1-\dfrac{1}{4}\right)\left(1-\dfrac{1}{5}\right)\)
\(\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\right)\)
chứng tỏ phân số sau tối giản vs mọi số tự nhiên n\(\dfrac{n+1}{2n+3}\)
2155-(174+2155)+(-68+174)=2155-174-2155-68+174
= -68
( 1 - \(\dfrac{1}{2}\) ) ( 1- \(\dfrac{1}{3}\)) ( 1 - \(\dfrac{1}{4}\)) ( 1 - \(\dfrac{1}{5}\)) = \(\dfrac{1}{2}.\dfrac{1}{3}.\dfrac{1}{4}.\dfrac{1}{5}\)
= \(\dfrac{1}{120}\)
Mình ps có 2 câu à ^.^!
( 377 / -231 - 123 / 89 + 34 / 791) . ( 1/6 - 1/8 - 1/24 )
= (377/-231-123/89+34/791).(4/24-3/24-1/24)
=(377/-231-123/89+34/791).0
=0
Thực hiện phép tính: (337/-231-123/89+34/791).(1/6-1/8-1/24)
Trả lời:
Thực hiện phép tính: A=(337/-231-123/89+34/791).(1/6-1/8-1/24)
ta có (1/6-1/8-1/24)=(4-3-1)/24=0
Nên A= (337/-231-123/89+34/791).0=0
Đáp số: A=0
(377/-231-123/89+34/791)*(1/6-1/8-1/24)
mong các bạn giúp mình với ! cầu cứu
(377/-231-123/89+34/791)*(1/6-1/8-1/24)
= (377/-231-123/89+34/791)*[4/24+(-3/24)+(-1/24)]
= (377/-231-123/89+34/791)* 0
= 0
\(\left(\frac{377}{-231}-\frac{123}{89}+\frac{34}{791}\right).\left(\frac{1}{6}-\frac{1}{8}-\frac{1}{24}\right)\)
\(=\left(\frac{337}{-231}-\frac{123}{89}+\frac{34}{791}\right).\left(\frac{4-3-1}{24}\right)\)
\(=\left(\frac{337}{-231}-\frac{123}{89}+\frac{34}{791}\right).0\)
\(=0\)
2.3/7+(2/9 - 1+3/7) - 5/3: 1/9
giúp mình với
Thực hiện phép cộng sau: P= \(\dfrac{1}{1-x}+\dfrac{1}{1+x}+\dfrac{2}{1+x^2}+\dfrac{4}{1+x^4}+\dfrac{8}{1+x^8}\)
Mọi người giúp em vs ạ! Em cần gấp
giúp mk với !
( 377/-231-123/89+34/791)x(1/6-1/8-1/24)
mong các bạn sẽ giúp mk !!!!