Воронова Татьяна:

1) (11,7 – x) : 1,2 = 3;

11,7 – x = 3 * 1,2;

– х = 3,6 – 11,7;

– х = – 8,1;

х = 8,1.

2) 2,7 * (15 – x) = 5,4;

15 – x = 5,4 : 2,7;

15 – x = 2;

– х = 2 – 15;

– х = – 13;

х = 13.

3) (x – 12) : 13,3 = 1;

x – 12 = 1 * 13,3;

х = 13,3 + 12;

х = 25,3.

4) 1,287 – x = 0,873;

– x = 0,873 – 1,287;

– x = – (1 + 0,287) + 0,873;

– x = – (1 – 0,873) – 0,287;

– x = – 0,127 – 0,287;

– х = – 0,414.

5) (9 – x) * 0,11 = 0,77;

9 – x = 0,77 : 0,11;

9 – x = 77/11;

9 – x = 7;

– x = 7 – 9;

– x = – 2;

х = 2.