Сократите дробь 18/40*45/27, 63/49*56/45, 35/30*42/49, 48/30*5/16*12/8

1) 18/40*45/27=2/8*9/3=16/24=4/6=2/3
2) 63/49*56/45=21/7*8/15=168/105=56/35=8/5=1 3/5=1,6
3) 35/30*42/49=5/5*7/7=1
4) 48/30*5/16*12/8= 3/6*1/1*12/8=36/48=3/4=0,75