(44.96+28.84:(13.7-10.9)):1.8
(44.96+28.84:(13.7-10.9)):1.8=30.7 1)13.7-10.9=2.8; 2)28.84:2.8=10.3; 3)44.96+10.3=55.26; 4)55.26:1.8=30.7. Как-то так:)