Предмет: Математика, автор: irinakoroleva22

Петя и вася смотрели парад техники.на всех было 34 руля и 92 колеса.сколько всего машин и сколько мотоциклов?

jekadva: 22мото и 12 машин

irinakoroleva22: Решение нужно

jekadva: (34*4-92):2 = 44:2=22мото и 34-22=12машин

Ответы

Автор ответа: jekadva

пусть х было мотоциклов
тогда машин было (34-х)

2x + 4*(34-x)=92
2x +136 - 4x = 92
-2x + 136 = 92
2x = 136 - 92
2x = 44
x = 44:2
x = 22мотоцикла
34 - 22 = 12 машин

irinakoroleva22: Спасибо большое,пол вечера ломаем голову

jekadva: (34*4-92):2 = 44:2=22мото и 34-22=12машин

jekadva: проще

jekadva: т.е быстрей

irinakoroleva22: Ага,с х не прокатило

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