Question

Oblicz. Daje naj za rozpisywanie. / to kreska ułamkowa :
3/7+2/5 =
3/11 + 1/2 =
4/5 + 3/4 =
8/9 - 3/4 =
11/12 - 2/5 =
5/9 - 1/2 =
1/3 + 1/6 =
2/7 + 4/21 =
2/5+1/20 =
11/15 - 1/3 =
25/27 - 4/9 =
23/24 - 5/12 =
4/15 + 7/10 =
9/12 + 5/16 =
3/4 - 3/10 =
21/24 - 5/36 =
4/9 + 7/8 =
4/9 + 2/5 =
7/8 + 6/7 =
2/5 + 6/7 =

Z góry dziękuję i patrzcie na punkty ;d wszystkie moje daje :) (polecam skopiowac)

Answer 1

3/7+2/5 = 
3/11 + 1/2 = 
4/5 + 3/4 =
8/9 - 3/4 = 
11/12 - 2/5 = 
5/9 - 1/2 = 
1/3 + 1/6 = 2/6 + 1/6 = 3/6 = 1/2 
2/7 + 4/21 = 6/21 + 4/21 = 10/21
2/5+1/20 = 8/20 + 1/20 = 9/20
11/15 - 1/3 = 11/15 - 5/15 = 6/15
25/27 - 4/9 = 25/27 - 12/27 = 13/27
23/24 - 5/12 = 23/24 - 10/24 = 13/24
4/15 + 7/10 =  8/30 + 21/30 = 29/30
9/12 + 5/16 = 36/48 + 15/48 = 51/48 = 1 3/48 = 1 1/16 
3/4 - 3/10 = 30/40 - 12/40 = 18/40 = 9/20
21/24 - 5/36 = 63/72 - 10/72 = 53/72 
4/9 + 7/8 = 32/72 + 63/72 = 95/72 = 1 23/72
4/9 + 2/5 = 20/45 + 18/45 = 38/45
7/8 + 6/7 =49/63 + 42/63 = 91/63 = 1 28/63
2/5 + 6/7 = 14/35 + 30/35 = 44/35 = 1 9/35 

Answer 2

3/7 + 2/5 = (sprowadzamy do wspólnego mianownika) = 15/35 + 14/ 35 = 29/35

3/11 + 1/2= 6/22 + 11/22= 17/22

4/5 + 3/4 = 16/20 + 15/20 = 31/20 = 1 i 11/20
8/9 - 3/4 = 32/36 - 27/36 = 5/36
11/12 - 2/5 = 55/60 - 24/60 = 31/60
5/9 - 1/2 = 10/18 -9/18= 1/18
1/3 + 1/6 = 2/6 +1/6= 3/6=1/2
2/7 + 4/21 = 6/21 + 4/21 = 10/21
2/5+1/20 = 8/20 + 1/20= 9/20
11/15 - 1/3 = 11/15 - 5/15 = 6/15= 2/5
25/27 - 4/9 = 25/27 - 12/27= 13/27
23/24 - 5/12 = 23/24 - 10/24 = 13/24
4/15 + 7/10 =  8/30 + 21/30 = 29/30
9/12 + 5/16 = 144/192 + 60/192= 204/192= 1 i 12/192
3/4 - 3/10 = 30/40 - 12/40 = 18/40 = 9/20
21/24 - 5/36 = 63/72 - 10/72= 53/72
4/9 + 7/8 = 32/72 + 63/72 = 95/72= 1 i 23/72
4/9 + 2/5 = 20/45 + 18/45= 38/45
7/8 + 6/7 = 49/56 + 48/56 = 97/56= 1 i 41/56
2/5 + 6/7 = 14/35 + 30/35= 44/35= 1 i 9/35