Minta tolong dong kasih tau cara nya nomer 4 sama 5 , pleassssss .......

4) 1 1/2 - 1 1/4 = 1/4
1 3/4 - 1 1/4 = 1/2
1/4 + 1/2 = 3/4

5) 2 3/5 x 2.5 : 75/100
13/5 x 2,5 x 100/75
2,6 x 2,5 x 4/3
6,4 x 4/3
65/10 x 4/3
13/10 x 4/3
13/2 x 14/3
26/3 = 8 2/3