-11/12x=7/12

x--7/11

\(\frac{-11}{12}.x+0,25=\frac{5}{6}\)

\(\frac{-11}{12}.x=\frac{5}{6}-\frac{1}{4}=\frac{7}{12}\)

\(x=\frac{7}{12}:\frac{-11}{12}=\frac{7}{12}.\frac{12}{-11}\)

\(x=\frac{7}{11}\)

-7/11 đúng ko

-11/12.y+1/4=5/6

-11/12.y      =5/6-1/4

-11/12.y      =7/12

y                =7/12:-11/12

y                =-7/11

\(\frac{-11}{12}.y+0,25=\frac{5}{6};-\frac{11}{12}.y=\frac{7}{12};y=-\frac{7}{11}\)

a. = 0,25 : 0,25 + 0,4 x 2,5 + 0,2 x 5 

= 1 + 1 + 1

= 3

b. y x ( 7 + 1 + 12 - 6 - 4) = 45 

y x 9 = 45 

=> y = 5

\(\dfrac{-11}{12}.x+0,25=\dfrac{5}{6}\)

\(\Rightarrow\dfrac{-11}{12}.x=\dfrac{5}{6}-0,25\)

\(\Rightarrow\dfrac{-11}{12}.x=\dfrac{7}{12}\)

\(\Rightarrow x=\dfrac{7}{12}:\dfrac{-11}{12}\)

\(\Rightarrow x=\dfrac{-7}{11}\)

Vậy...........

-11/12.x+0.25=5/6 (1)

<=> -11/12.x=5/6-0.25

<=>-11/12.x=7/12

<=>x= 7/12:(-11/12)

<=>x=84/-132=

Vậy nghiệm của phương trình (1) là:

S={-7/11}

a=113/13-(24/7+53/13)=113/13-24/7-53/13=60/13-24/7=396/16

b=(64/9+37/11)-44/9=64/9+37/11-44/9=20/9+37/11=181/33

c=-5/7(2/11+9/11)+15/7=-5/7+15/7=10/7

d=0.7.22/3.20.0.375.5/28=0

e=(6,17+35/9-236/97)(1/3-0.25-1/12)=A.(1/3-1/4-1/12)=A.(1/12-1/12)=A.0=0

e=(6,17 + 3 5/9 - 2 36/97 ) . ( 1/3 - 0,25 - 1/12)=(6,17 + 3 5/9 - 2 36/97 ) .(1/3-1/12-0,25)

=(6,17 + 3 5/9 - 2 36/97 ) .(4/12-1/12-0,25)=(6,17 + 3 5/9 - 2 36/97 ) .(3/12-0,25)

=(6,17 + 3 5/9 - 2 36/97 ) .(1/4-0.25)=(6,17 + 3 5/9 - 2 36/97 ) .(0.25-0.25)

=(6,17 + 3 5/9 - 2 36/97 ) .0=0

Vậy E=0

\(-\left(0,25\right)-\frac{11}{5}\)

\(=-\frac{1}{4}-\frac{11}{5}\)

\(=-\frac{5}{20}-\frac{44}{20}\)

\(=\frac{-59}{20}\)

\(-\left(0,25\right)-\frac{11}{5}\)

\(=-\frac{1}{4}-\frac{11}{5}\)

\(=\frac{-5}{20}-\frac{44}{20}\)

\(=\frac{-59}{20}\)

-(-0,25) - \(\frac{11}{5}\)= \(\frac{1}{4}\)- \(\frac{11}{5}\)= \(\frac{5}{20}\)- \(\frac{44}{20}\)= \(\frac{-39}{20}\)