a) 2 i 3/10 + 1/4 =2 i 6/20 + 5/20 = 2 i 11/20
b) 6 i 78/100 - 3/8 = 6 i 156/200 + 75/200 = 6 i 81/200
c) 7/9 * 6 i 3/10 = 7/9 * 63/10 = 7/1 * 7/10 = 49/10 = 4 i 9/10
d) 1 i 2/5 : 25/100 = 7/5 : 25/100 = 7/5 * 100/25 = 7/1 * 100/5 = 7/1 * 20/1 = 140/1 = 140
MAM NADZIEJĘ ŻE POMOGŁAM
