Предмет: Математика, автор: JOANA

з задания решите все не поленитесь плиз!                                                      

1.из города выехал велосипедист на гоночном велосипеде со скоростью 18км в час. спустя 2 часа за ним из того же города выехал мотоциклист со скоростью 24 км в часчерез сколько часов мотоциклист догонит велосиписта и на каком расстоянии от города?                                                                                    

2. в два овощных ларька привезли 64кг груш, причем во второй ларёк привезли в 3 раза больше, чем в первый.Сколько кг груш привезли в каждый ларёк?

3.реши уравнения

485-7*с=310

457-(с-211)=278

не пишите если не уверены

 

Ответы

Автор ответа: love67
0

18*2=36км проедет велосепедист до выезда мотоциклист

 через час после выезда мотоцеклиста

36+18=54 км проедет велосипидист

 24 км проедет мотоцеклист

 через 2 часа

36+2*18=72 км проедет велосепедист

24*2 =48 км проедет мотоцеклист

через 3 часа

36+3*18=90 км проедет велосепедист

 24*3=72 км проедет мотоцеклист

через 4 часа

36+4*18=108  проедет велосепедист

24*4=96 км проедет мотоцеклист

через  5 часов

36+5*18=126проедет велосепедист

24*5=120 проедет мотоцеклист

через 6 часов

36+6*18=144 км проедет велосепедист

24*6=144 км проедет мотоцеклист

Ответ через 6 часов мотоцеклист догонит велосепедиста, когда проедут расстояние 144 км

задача 2

х+3х=64

4х=64

х=16кг привезли в один ларек

16*3=48 привезли в другой ларек

3.реши уравнения

485-7*с=310

7с=485-310

7с=175

с=25

проверкка

485-7*25=310

 

 

457-(с-211)=278

457-с+211=278(*-1)

-457+с-211=-278

с=-278+211+457

с=390

457-(390-211)=278

 

 

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