KERCISE 7.2
Add the following expressions:
(a) 3xyz + 4yz + 5zx, 7xz - 6yz + 4xyz and -9xyz - 11:
(b) x - 2y + x, yo - 2rº + y and -2y + 2y3 - 5x + 4r
(c) 7p2 - 4p²q + 89?, 5q? - 2p% + 6pq and 3p q + 10p
(d) 9x2 - 7x + 5, -14x2 - 6 + 15x and 20x² + 40x - 1
e) -m - 3mn + 3n2 + 8, 3m2 - 5n2 - 3 + 4mn and
Hvorf.
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