Răspuns:
56:8=(56x3):(8x3)
7=168:24
7=7
72:18=(73x2):(18x2)
4=144:36
4=4
99:11=(99x5):(11x5)
9=495:55
9=9
180:36=(180x10):(36x10)
5=1800:360
5=5