2— : 91— = — :x1x+ — x = 12.5 3851 — :7 —= 1 — :7652 — :7 —= 1 — :3623 — :1 —= 1 — :4544 — :6 —= 1 — :553xxxx 2
8× 6- 0.2x
3× 5- 0.2x
3 —1 x- 43
27— = 3.2 — x0.8
= 6.9 = 2
=4.8
2 — : 1 1 — = — : x 1 x- — x = 12.5 3 6 7 7 — : 8 — = 1 — : 6 9 6 1 — : 3 — = 1 — : 8 4 5 4 — : 1 — = 1 — : 3 9 9 1 — : 7 — = 1 — : 9 6 7 x x x x 6
6× 9 - 6.4x
8× 5 - 0.4x
1 —1 x - 93
10 — = 8 — x 0.6
= 1.3 = 4
=9.6
5 — : 1 — = 1 — : 4 5 7 1 — : 1 — = 1 — : 2 4 7 7 — : 6 — = 1 — : 6 7 6 8 — : 1 — = 1 — : 9 7 2 8 — : 4 — = 1 — : 9 5 4 x x x x x x+ —1 x = 44 84× 6 - 6.4x = 6.7 4× 5 - 8x = 21 —1 x - 7 =7.4 415 — = 0.4 — x 0.6
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