1)Упростите выражение: а)17+а+24-а  б)5y+b+10-b-10 в)2 1/7+x-y+10 6/7-x+y

Г)0,29-x-а+0,71+x+a

 

2)Упростите выражение:a) 15+(n-18) б)-(8-x)-x в)(x-4)-(x+5) г)-(у-a-3)-(4+a) д)-(16-b+c)+(8+c)

 

/-дробь

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