1. a) 2x = 5/:2 x = 2,5 spr. 2,5 * 2 = 5 4a = 7/:4 a = 1,75 spr. 1,75 * 4 = 7 b)15 - x = 7 i 1/3 x = 7 i 1/3 - 15 x = 7 i 2/3 spr. 15 - 7 i 2/3 = 7 i 1/3 m - 1 i 5/6 = 2 i 2/3 m = 2 i 2/3 + 1 i 5/6 m = 2 i 4/6 + 1 5/6 m = 3 i 9/6 m = 4 i 3/6 spr. 4 i 3/6 - 1 i 5/6 = 2 i 4/6 (2 i 2/3) c) 25 : b = 6 6b = 25 /:6 b = 4,1(6) - co do tego nie jestem pewna d : 4 = 5 i1/2 d = 5 i 1/2 * 4 d = 22 spr. 22 : 4 = 5 i 1/2
2x=5x = 5/2 = 2 1/2 4a=7 a = 7/4 = 1 3/4 15-x=7 i jedna trzecia -x = 7 1/3 - 15 -x = -7 2/3 x = 7 2/3 m-jeden i pięć szóstych=dwa i dwie trzecie m - 1 5/6 = 2 2/3 m = 2 2/3 + 1 5/6 m = 2 4/6 + 1 5/6 = 3 9/6 = 4 3/6 = 4 1/2 25:b=6 obie strony mnozymy przez b 25 = 6b b = 25/6 = 4 1/6 d:4=pięć i jedna druga d/4 = 5 1/2 d/4 = 11/2 d = 44/2 = 22
