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PB
0
23 tháng 5 2022
a: \(=\dfrac{11}{21}+\dfrac{10}{21}+\dfrac{-2}{7}+\dfrac{-5}{7}-\dfrac{6}{5}=\dfrac{-6}{5}\)
b: \(=\left[0.25\cdot\left(-4\right)\right]^5\cdot\left(-\dfrac{50}{9}\right)\)
=50/9
c: \(=\dfrac{3}{22}\left(19+\dfrac{1}{7}+2+\dfrac{6}{7}\right)-6\)
\(=\dfrac{3}{22}\cdot22-6=3-6=-3\)
TQ
23 tháng 7 2016
a/ -7/2+3/4-17/12=-42/12+9/12-17/12=-50/12=-25/6
b/ 3/4+[-9/5]-4/3=45/60-108/60-80/60=-142/60=-71/30
c/ -1/12-[21/3-1/3]=-1/12-20/3=-1/12-80/12=-81/12=-27/4
d/ 22/7.[-7/11]+18= -2+18=16
e/ [3/4+2/3]:17/4-3/4=[9/12+8/12]:17/4-3/4=17/12:17/14-3/4=14/12-3/4=14/12-9/12=5/12
TD
3 tháng 2 2022
\(\dfrac{7}{22}:\dfrac{3}{11}+\dfrac{7}{22}:\dfrac{4}{11}=\dfrac{7}{22}.\dfrac{11}{3}+\dfrac{7}{22}.\dfrac{11}{4}=\dfrac{7}{22}\left(\dfrac{11}{3}+\dfrac{11}{4}\right)=\dfrac{7}{22}.\dfrac{77}{12}=\dfrac{49}{24}\)
HL
11 tháng 11 2018
a, 7/12 - 3/4 . 5/6
= 7/12 - 5/8
= 14/24- 15/24
= -1/24
b,( 2/1/3 + 1/3/4 ) . 12/13
= ( 6/3 + 7/3 ) . 12/13
= 13/3 . 12/13
=4
c, 12 : ( 3/4 -5/6 ) . 2
= 12 : ( -1/12 ) .2
= 12 . -12 . 2
= -228
d, 7/22 : 3/11 + 7/22 : 4/11
= 7/22 . 11/3 + 7/22 . 11/4
= 7/22 . ( 11/3 + 11/4 )
....
tiếp theo bạn tự làm nhé!
\(-\dfrac{7}{22}\cdot\dfrac{5}{3}+\dfrac{-7}{22}\cdot\dfrac{1}{3}-\dfrac{-7}{22}\cdot\dfrac{11}{21}\)
\(=-\dfrac{7}{22}\cdot\left(\dfrac{5}{3}+\dfrac{1}{3}\right)+\dfrac{7}{21}\cdot\dfrac{11}{22}\)
\(=-\dfrac{7}{22}\cdot2+\dfrac{1}{3}\cdot\dfrac{1}{2}=-\dfrac{7}{11}+\dfrac{1}{6}\)
\(=\dfrac{-42+11}{66}=\dfrac{-31}{66}\)
\(-\dfrac{7}{22}\cdot\dfrac{5}{3}+\dfrac{-7}{22}\cdot\dfrac{1}{3}-\left(-\dfrac{7}{22}\right)\cdot\dfrac{11}{21}\\=-\dfrac{7}{22}\cdot\dfrac{5}{3}-\dfrac{7}{22}\cdot\dfrac{1}{3}-\dfrac{7}{22}\cdot\dfrac{-11}{21}\\ =-\dfrac{7}{22}.\left(\dfrac{5}{3}+\dfrac{1}{3}-\dfrac{11}{21}\right)\\ =-\dfrac{7}{22}\cdot\dfrac{31}{21}\\ =-\dfrac{31}{66}\)