64:4+4=20
8*12:3-3=29
60:(5*12)=1
90:45+90:30=2+3=5
17*5-17*4=85-68=17
72:3=24
19:3=6,(3)
16*3=48
3*27=81
91:3=30,(3)
64:4+4=20
8*12:3-3=29
60:(5*12)=1
90:45+90:30=2+3=5
17*5-17*4=85-68=17
72:3=24
19:3=6,(3)
16*3=48
3*27=81
91:3=30,(3)