Ответы на вопрос:
15.8-(2а+3.6)÷0.4=4.8 (2а+3.6)÷0.4=15.8-4.8 (2а+3.6)÷0.4=11 2а+3.6=11×0.4 2а+3.6=4.4 2а=4.4-3.6 2а=0.8 а=0.8÷2 а=0.4
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