Вопрос школьника по предмету Математика
решите уравнения x-420*13=800,y-420*14=800,d-420*15=800
Ответ учителя по предмету Математика
х-420*13=800 у-420*14=800 д-420*15=800
х-5460=800 у-5880=800 д-3360=800
х=5460+800 у=5880+800 д=3360+800
х=6260 у=6680 д=4260
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In old times (31)___(Egypt) children played similar games to the ones they play today. They also played with dolls, toy soldiers (32)____(wood) animals, balls, marbles, spinning tops. Most children in Egypt didn’t go to school. Instead boys learnt (33)____(farm) or other trades from their fathers. Girls learnt (34)___(sew), (35)___(cook) and other skills from their mothers. Boys from (36)____(wealth) families sometimes learnt to be scribes. They learnt by (37)____(COPY) and (38)____(memorise) and discipline was strict. (39)____(teach) beat naughty boys. The boys learnt reading and (40)____(write) and also mathematics.
-|5а-1|=|-4а+0,8|
|8с+2-4с|=|5+3с+4|