а) 27.36×0.1-0.09=2.736-0.09=2.646; б)(54.23×3.2-54.13×3.2+0.68):0.2=(173.536-173.216+0.68):0.2=1:0.2=10:2=5; в) (23.82+54.58)×(1.202+0.698)-2.1×(3.53-1.89)=78.4×1.9-2.1×1.64=148.96-3.444=145.516; г) 316 219-(27 090:43+16 422:119)=316 219-(630+138)=316 219-768=315 451