Odpowiedź:
1.
A = ( - 1, 2) B = ( 2, - 3)
-->
AB = [ 2 - (-1), -3 - 2 ] = [ 3, - 5 ]
Odp. B
======
2.
A = ( 2 , - 1 ) B = ( - 3, 2 ) C = ( 1, 1 )
AB = [ - 3 - 2, 2 - (- 1 ) ] = [ -5 , 3 ]
AC = [ 1 - 2 , 1 - (- 1) ] = [ - 1, 2 ]
więc
CA = [ 1 , - 2 ]
oraz
--> -->
AB + CA = [ -5 , 3 ] + [ 1, - 2 ] = [ - 5 + 1 , 3 - 2 ] = [ - 4 , 1 ]
Odp. A
===========
3.
B = ( - 2, 3 )
A = ( x , y)
AB = [ -3, 4 ]
AB = [ -2 - x, 3 - y ] = [ - 3, 4 ]
zatem -2 - x = - 3 i 3 - y = 4
x = -2 + 3 = 1 i y = 3 - 4 = - 1
Odp. A = ( 1 , - 1 )
====================
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Odpowiedź:
1.
A = ( - 1, 2) B = ( 2, - 3)
-->
AB = [ 2 - (-1), -3 - 2 ] = [ 3, - 5 ]
Odp. B
======
2.
A = ( 2 , - 1 ) B = ( - 3, 2 ) C = ( 1, 1 )
-->
AB = [ - 3 - 2, 2 - (- 1 ) ] = [ -5 , 3 ]
-->
AC = [ 1 - 2 , 1 - (- 1) ] = [ - 1, 2 ]
więc
-->
CA = [ 1 , - 2 ]
oraz
--> -->
AB + CA = [ -5 , 3 ] + [ 1, - 2 ] = [ - 5 + 1 , 3 - 2 ] = [ - 4 , 1 ]
Odp. A
===========
3.
B = ( - 2, 3 )
A = ( x , y)
-->
AB = [ -3, 4 ]
więc
-->
AB = [ -2 - x, 3 - y ] = [ - 3, 4 ]
zatem -2 - x = - 3 i 3 - y = 4
x = -2 + 3 = 1 i y = 3 - 4 = - 1
Odp. A = ( 1 , - 1 )
====================
Szczegółowe wyjaśnienie: