Scrie termenul care lipseste pentru a putea restrange sun forma (a+b)^2 sau (a-b)^2

a) x^2+6x….
b) a^2-….+9
c) x^2+14x…
d) 4x^2+…+25
e) x^2-18x…
f) 9a^2-36a….
g) x^2-24x…
h) 9x^2-30x…
i) 9x^2-30x…
j) 25m^2-40m…


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