Ответ Автор - selmash21 15.8-(2а+3.6)÷0.4=4.8(2а+3.6)÷0.4=15.8-4.8(2а+3.6)÷0.4=112а+3.6=11×0.42а+3.6=4.42а=4.4-3.62а=0.8а=0.8÷2а=0.4