Ответ:
=0.3b-0.9b+2.46+0.7b=(0.3b-0.9b+0.7b)+2.46= 0.1b+2.46
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Ответ:
=0.3b-0.9b+2.46+0.7b=(0.3b-0.9b+0.7b)+2.46= 0.1b+2.46