Sagot :
a) x1 + x2 = 1+1 = 1
———— ——
2 2
y1 + y2 = 3+5 = 4
———— ———
2 2
I(1;4)
b) x1 + x2 = (-2)+2 = 0
———— ———-
2 2
y1 + y2 = 1+7 = 4
———— ——
2 2
I(1;4)
c) x1 + x2 = (-1)+3 = 1
———— ——
2 2
y1 + y2 = 10+0 = 5
———— ——
2 2
I(1;5)
d) x1 + x2 = 3+2 = 2,5
———— ——-
2 2
y1 + y2 = 4+(-1) = 1,5
———— ——-
2 2
———— ——
2 2
y1 + y2 = 3+5 = 4
———— ———
2 2
I(1;4)
b) x1 + x2 = (-2)+2 = 0
———— ———-
2 2
y1 + y2 = 1+7 = 4
———— ——
2 2
I(1;4)
c) x1 + x2 = (-1)+3 = 1
———— ——
2 2
y1 + y2 = 10+0 = 5
———— ——
2 2
I(1;5)
d) x1 + x2 = 3+2 = 2,5
———— ——-
2 2
y1 + y2 = 4+(-1) = 1,5
———— ——-
2 2