15.
MS Excel, , , .
A) → →
A1.1 * B1.2 * C1.3 = n
A2.1 * B2.2 * C2.3 = n
A3.1 * B3.2 * C3.3 = n
:
A1.1 * B1.2 * C1.3
A2.1 * B2.2 * C2.3
A3.1 * B3.2 * C3.3 = .
B) :
3x + 4y = 8
4x + 8y = 1
, . :
x = 7,5
y = -3,625
. . , (, z). (. 128.1).
. 128.1. .
- . , , . , :
3x - 8 = -4y
3x + 4y = 8. - n x n, n . . 128.1 I2:J3.
- ( ) . . 128.1 L2:L3.
- . . 128.1 I6:J7 ( Ctrl+Shift+Enter, ): =(I2:J3).
- . . 128.1 J10:JJ11, (x = 7,5 = -3,625): =(I6:J7;L2:L3). . 128.2 , .
. 128.2. Excel , .
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