1) 131,67:11,4+49,152:9,6-3,08*2,6=8,662
131,67 :11,4=11,55
49,152 :9,6=5,12
3,08*2,6=8,008
11,55+5,12-8,008=16,67-8,008=8,662
2) (7-5,38)*2,5+(8-6,46)*1,5-17,01:6,3=3,66
7-5,38=1,62
1,62*2,5=4,05
8-6,46=1,54
1,54*1,5=2,31
17,01 :6,3=2,7
4,05+2,31-2,7=6,36-2,7=3,66
3) 301260:15-425:(112-87)*12=19880
301260 :15=20084
112-87=25
425:25=17
17*12=204
20084-204=19880