а) \(0.84:2.1+3.5\cdot0.18-0.08=0.4+0.63-0.08=0.95\).
б) \(3.8\cdot0.15-1.04:2.6+0.83=0.57-0.4+0.83=1\).
в) \(6.8+0.32\cdot(262.6:6.5-30.4)=6.8+0.32\cdot(40.4-30.4)=10\).
г) \(4.99962+(156.156:7.8-20.019)\cdot0.38=4.99962+(20.02-20.019)\cdot0.38=5\).
д) \(400-(5.437+1.363)\cdot6.02-4.02=400-6.8\cdot6.02-4.02=355.044\).
е) \(6.4-1.4\cdot(28.5:19)=6.4-1.4\cdot1.5=4.3\).
Ответ: а) 0,95; б) 1; в) 10; г) 5; д) 355,044; е) 4,3.