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b) 4xy- 2y² = 4 * 4 * -1/2 - 2 * -1/2² = 16 * -1/2 - 2 * 1/4 = - 8 - 2/4 = -8 i 2/4 i po skróceniu 2/4 będzie - 8 i 1/2
To wszystko =D jak czegos nie rozumiesz pytaj