Oblicz, korzysatając z odpowiedznich wzorówa) 76²b) 101²c) 99 · 100 d) 27 · 33
a) = (80 - 4 )^2= 6400 - 640 + 16 = 5776
b ) = ( 100 +1 )^2 = 10000 + 200 + 1 =10201
c) = ( 100 - 1) * 100 =10000- 100 = 9900
d) = (30 - 3)(30 + 3) = 900 - 9 =891
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a) = (80 - 4 )^2= 6400 - 640 + 16 = 5776
b ) = ( 100 +1 )^2 = 10000 + 200 + 1 =10201
c) = ( 100 - 1) * 100 =10000- 100 = 9900
d) = (30 - 3)(30 + 3) = 900 - 9 =891