Răspuns :
20:5=2x
4=2x
x=4:2
x=2
...........................
36:a=2x2
36:a=4
a=36:4
a=9
..........................
24:3:4=
8:4=2
...................................
3x=5x6
3x=30
x=30:3
x=10
............................
a:5=20:4
a:5=5
a=5x5
a=25
................................
21:a=15:5
21:a=3
a=21:3
a=7
4=2x
x=4:2
x=2
...........................
36:a=2x2
36:a=4
a=36:4
a=9
..........................
24:3:4=
8:4=2
...................................
3x=5x6
3x=30
x=30:3
x=10
............................
a:5=20:4
a:5=5
a=5x5
a=25
................................
21:a=15:5
21:a=3
a=21:3
a=7
20:5=2x 2x=4 x=4:2 x=2
36:x=2*2 4x=36 x=36:4 x=9
3x=5*6 x=30:3 x=10
x:5=20:4 x=5*5 x=25
21:x=15;5 21;x=3 3x=21 x=21;3 x=7
36:x=2*2 4x=36 x=36:4 x=9
3x=5*6 x=30:3 x=10
x:5=20:4 x=5*5 x=25
21:x=15;5 21;x=3 3x=21 x=21;3 x=7