x-y=-5
x+y=11
---------
2x = 6 |:2
x = 3
x=3
y=11-3
y=8
Teraz obliczamy watość wyrażenia x²-y²:
3²-8² = 9-64 = -55
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x-y=-5
x+y=11
---------
2x = 6 |:2
x = 3
x=3
y=11-3
x=3
y=8
Teraz obliczamy watość wyrażenia x²-y²:
3²-8² = 9-64 = -55