\(\dfrac{9}{2}+\left(x-\dfrac{3}{4}\right)=\dfrac{25}{4}\\x-\dfrac{3}{4}=\dfrac{25}{4}-\dfrac{9}{2}\\ x-\dfrac{3}{4}=\dfrac{7}{4}\\ x=\dfrac{7}{4}+\dfrac{3}{4}\\ x=\dfrac{5}{2} \)

5/2

\(\dfrac{5}{2}\)

57,25 x 0,25 x 4

= 57,25 x (0,25 x 4)

= 57,25 x 1

= 57,25

=>-7x-13=9*4=36

=>-7x=49

=>x=-7

92 – 7.(3x + 52)= 8⁶ : 8⁴

92-21x-364=8^6-4

92-21x-364=8²

92-21x-364=64

-21x=64-92+364

-21x=336

x=336:(-21)

x=-16

\(92-7.\left(3x+52\right)=8^6:8^4\\ \Leftrightarrow92-21x-364=8^2\\ \Leftrightarrow-21x=64-92+7.52\\ \Leftrightarrow-21x=336\\ \Leftrightarrow x=\dfrac{336}{-21}=-16\)

\(92-7.\left(3x+52\right)=8^6:8^4\)

\(92-21x-364=64\)

\(-21x=64+364-92\)

\(-21x=336\)

\(x=\dfrac{336}{-21}\)

\(x=-16\)

25+25+25-25=(25+25)+(25-25)=50+0=50

25+25+25-25=75-25

                   =50

Ủng hộ mk nha

25+25+25-25=50

k cho tui zới!!!

=100+100+100

=300

ai k tui tui k lại 

100+25+75+25+75

=125+75+25+75

=200+25+75

=225+75

=300

100 + 25 + 75 + 25 + 75

= 125 + 75 + 25 + 75

= 200 + 25 + 75

= 225 + 75

= 300

100 + 25 + 75 + 25 + 75

= 100 + (25 + 75) + (25 + 75)

= 100 + 100 + 100

= 100 x 3

= 300

t.i.c.k có được điểm đâu

<=>21-46+x=-18

<=>-25+x=-18

<=>x=7

21-(25-x+21)=-(25-7)

21-25+x-21=-18

-25+x=-18

x=(-18)-(-25)

x=7