20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50

= 20 x 5 + 50 x 4

= 100 + 50 x 4

= 100 + 200

= 300

x + 50 - 20 = 50 + 20

x + 50 - 20 = 70

x + 50 = 70 + 20

x + 50 = 90

x = 90 - 50

x = 40

Ủng hộ tíck mik nha !!! 

tính nhanh

20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50

= (20 x 5) + (50 x 4)

=       100  +     200

=          300

tìm x:

x + 50 - 20 = 50 + 20

x + 50 - 20 = 70

x + 50        = 70 + 20

x + 50        = 90

             x   =  90 - 50

             x    = 40

tchs mik tchs lại

x+20=20+50+50

x+20=120

x=120-20

x=100

k nhé trang rùi mình k lại

x + 20 = 20 + 50 + 50

x + 20 = 70 + 50

x + 20 = 120

x        = 120 - 20

x        = 100

x + 20 = 50 + 50 + 50

x + 20 = 50 x 3

x + 20 = 150

=> x   =  130.

x+20=3x50=150

x=150-20=130

x=130

thu lai 130+20 = 50+50+50=150

x + 50 = 20 + 50

x + 50 = 70

x = 70 - 50

x = 20

x + 50 = 20 + 50

x + 20  = 70

x         = 70 - 20

x         = 50

x - 20 = 50 + 50

x - 20 = 100

       x = 100 + 20

       x = 120

tk nha

x - 20 = 50 + 50

x - 20 = 100

x       = 100 + 20

x       = 120

x + 50 = 50 + 20

x + 50 = 70

x        = 70 - 50

x       = 20

x + 50 = 50 + 20

x + 50 = 70

         x = 70 - 50

         x = 20

ai tk mk mk tk lại 

x + 20 = 50 + 50

x + 20 = 100

x         = 100 - 20

x         = 80

Vậy x = 80

x + 20 = 50 + 50

x + 20 = 100

x         = 100 - 20

x         = 80

20 + 60 + 50 + 80 + 90 + 10 + 50 + 60 x 10

= (20 + 80) + (50 + 50 ) + (90 + 10 ) + 600 + 60

=     100     +      100     +      100     + 660

=              960

=(20+80)+(50+50)+(90+10)+(60*10)+60

=100+100+100+600+60

=960

\(50+90=90+50=140\)

\(90+600=600+90=690\) .

\(x:2=50+20\)

\(\frac{x}{2}=70\)

 \(x=70.2=140\)

\(x+25=\frac{100}{25}\)

\(x+25=4\)

\(x=4-25\)

\(x=-21\)

50 + 90 = 90 + 50

90 + 600 = 600 + 90

Tìm x 

x : 2 = 50 + 20

x : 2 = 70

x = 70 * 2

x = 140

x + 25 = 50 *2

x + 25 = 100

x = 100 - 25

x = 75