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efectuati (formule cu calcu prescurtat)
(2x-3y)²=
(4+2x)²=
(3x+1)²-(x+3)²=
(3x+5)²-(x+1)²=
(2x+y+4)²=
(2x-3y-5z)²=
(2x-y-3)²=​