Question

703. Решите уравнения
помоги плиз!!!!!!
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Answer 1

Ответ:

1) (x+y)-(y-z)-(z+2.9) = x+y-y+z-z-2.9 = x-2.9

2) (a+8)-(a+b)+(b-c) = a+8-a-b+b-c = -c+8

3) (7-m)+(m+n)-(n-k) = 7-m+m+n-n+k = k+7

4) (x-n)+(m-5)-(m-n) = x-n+m-5-m+n = x-5