41*36+59*90+41*84+59*30
=41*36+41*84+59*90+59*30
=41*(36+84)+59*(90+30)
=41*120+59*120
=(41+59)*120
=100*120=12 000
=41x36+41x84+59x90+59x30
=41x(36+84)+59x(90+30)
=41x120+59x120
=120x(41+59)
=120x100
=12000
=41x36+41x84+59x90+59x30
=41x(36+84)+59x(90+30)
=41x120+59x120
=120x(41+59)
=120x100
=12000