Предмет: Математика, автор: natasha148

Решить пожалуйста все номера

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Автор ответа: milan175

№1 (4+4,2+4,8+5)/4=18/4=4,5
№2 (0,1+х+8,4)/3=4
х+8,5=12
х=3,5
№3 Vср.=(V1t1+V2t2)/(t1+t2)=(60*1,2+80*2,8)/(1,2+2,8)=(72+224)/4=74 км/ч

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