Zad 12/str 88- matematyka 2 gimnazjum. Oblicz.: a) (√2+1)(√2-1) b) (8-5√3)(8+5√3) c) (√π-√2)(√ π+√2)(π+2) d) (pod pierwiastkiem :π+1 poza pierwiastkiem + pod pierwiastkiem π-1)(pod pierwiastkiem π+1 poza pierwiastkiem π-1)
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a) (√2+1)(√2-1) = 2 - 1 = 1
b) (8-5√3)(8+5√3) = 64 - 75 = -11
c) (√π-√2)(√ π+√2)(π+2) = (π - 2)(π + 2) = π² - 4
d) ---