6 — :1 —= 1 — :7591 — :10— = 1 — :7987 — :3 —= 1 — :6296 — :4 —= 1 — :7381 — :6 —= 1 — :953 xxxxxx-—1x = 9.587× 6- 6.4x = 3.3 7× 8- 8x = 6.55 —1 x+ 2 =2.534 —= 0.5 — x0.7
7 — : 4 — = 1 — : 6 3 2 9 — : 3 — = 1 — : 8 4 5 3 — : 1 — = 1 — : 4 3 5 1 — : 6 — = 1 — : 8 5 8 8 — : 6 — = 1 — : 9 7 6 x x x x x x- —1 x = 1.5 97× 6 - 4x = 4.8 7× 9 - 0.2x = 4.56 —1 x - 2 =2.8 418 — = 6.4 — x 0.6
1 — : 1 1 — = — : x 1 x+ — x = 49 2 3 9 3 — : 1 — = 1 — : 4 6 6 3 — : 10 — = 1 — : 4 9 3 1 — : 10 — = 1 — : 3 9 2 8 — : 5 — = 1 — : 7 6 4 x x x x 3
5× 6 - 6.4x
5× 5 - 1.6x
6 —1 x - 25
20 — = 6.4 — x 0.9
= 7.4 = 7
=2.5
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