1. Rozwiąż równanie i sprawdź.
3/4 + b = 2 3/5
b=.....
spr.....
b = 2 3/5 - 3/4
b = 13/5 - 3/4
b = 13/20 - 3/20 = 10/20 = 1/2
spr.
3/4 + 1/2 = 2 3/5
3/8 + 1/8 = 2 3/5
4/8 = 2 3/5
2/4 = 2 3/5
1/2 = 2 3/5
b = 13/5 - 3/4 (13/5 to inaczej 2 3/5)
b = 52/20 - 15/20 (do wspolnego mianownika)
b = 37/20
3/4 + 37/20 = 15/20 + 37/20 = 52/20
52/20 = 13/5 = 2 3/5
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3/4 + b = 2 3/5
b = 2 3/5 - 3/4
b = 13/5 - 3/4
b = 13/20 - 3/20 = 10/20 = 1/2
spr.
3/4 + 1/2 = 2 3/5
3/8 + 1/8 = 2 3/5
4/8 = 2 3/5
2/4 = 2 3/5
1/2 = 2 3/5
b = 2 3/5 - 3/4
b = 13/5 - 3/4 (13/5 to inaczej 2 3/5)
b = 52/20 - 15/20 (do wspolnego mianownika)
b = 37/20
spr.
3/4 + 37/20 = 15/20 + 37/20 = 52/20
52/20 = 13/5 = 2 3/5