7y-23=2(1/5y+38)
7y-23=0.4y+76
7y-0.4y=76+23
6.6y=99
y=99/6.6
y=15
Ответ:
Пошаговое объяснение:
23,4 : 3/4 = 23,4 * 4/3 = 7,8 * 4 = 31,2км/ч скорость сближения мотоциклиста (скорость по отношению к велосипедисту)
31,2 + 13,2 = 44,4км/ч скорость мотоциклиста
4+2+2+4+2+6=20
Неизвестные стороны находятся графически.
АВ=4 - по условиям
ВС=2 - по условиям
EF=2 - по условиям
AF=6 - по условиям
DE=AF-BC=2
CD=AB-EF=2
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