Oblicz
kk: Oblicz (√4−√7+√4+√7)2
(√2+√5−√√5−2)2
29 paź 20:23
dero2005:
(√4−√7 + √4+√7)2 = (√4−√7)2 + 2(√4−√7)(√4+√7) + (√4+√7)2 =
= 4−√7 + 2(√(4−√7)(4+√7) = 4 + √7 = 8 + 2√16−7 = 8 + 2√9 = 14
(a+b)2 = a2 + 2ab + b2
(a+b)(a−b) = a2 − b2
√a*√b = √a*b
29 paź 20:38