7 - 8 = -1
Пошаговое объяснение:
a - b = (a^1/2 - b^1/2)*(a^1/2 + b^1/2)
((a^1/2 - b^1/2)*(a^1/2 + b^1/2))/(a^1/2 - b^1/2) = (a^1/2 + b^1/2) =
= √9 + √16 = 3 + 4 = 7
2 * b^(-1/2 + 1) = 2√b = 2*4 = 8
7 - 8 = -1
Пошаговое объяснение:
a - b = (a^1/2 - b^1/2)*(a^1/2 + b^1/2)
((a^1/2 - b^1/2)*(a^1/2 + b^1/2))/(a^1/2 - b^1/2) = (a^1/2 + b^1/2) =
= √9 + √16 = 3 + 4 = 7
2 * b^(-1/2 + 1) = 2√b = 2*4 = 8