46. Доведіть тотожність:
1) -(2x - y) = y - 2x;
2) 2(x - 1)-2x = = -2;
3) 2(x – 3) + 3(x + 2) = 5x;
- 4) c - 2 = 5(c + 2) - 4(c + 3).
даю 20 балов
1) -(2x - y) = y - 2x;
2) 2(x - 1)-2x = = -2;
3) 2(x – 3) + 3(x + 2) = 5x;
- 4) c - 2 = 5(c + 2) - 4(c + 3).
даю 20 балов
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-2х+у=у-2х
2) 2(х-1)-2х=-2
2х-2-2х=-2
-2=-2
3) 2(х-3)+3(х+2)=5х
2х-6+3х+6=5х
5х=5х
4) с-2=5(с+2)-4(с+3)
с-2=5с+10-4с-12
с-2=с-2