Page 65 - aljaber

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.

:

1×2 × 3× 4 × 5 × 6 = 720

2 × 3 × 4 ×5 × 6 × 7 = 5040
3 × 4 × 5 × 6 × 7 × 8 = 20160

4 × 5 × 6 × 7 × 8 × 9 = 60480

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N .1,2, 3, 4, 6,9,12,18, 36 36

N = 1, 2, 4, 7,10,16, 34 36 N +2

7

W +Y :( ) ()
XZ
ZX
. WY
:

W + Y = 1 + 2 = 26 = 13
X Z 9 8 72 36

.( ) W + Y = 2 + 1 = 17 ( )
X Z 9 8 72
X =9 X =9
.

:( )

.Y = 9 X = 8 Y = 8