1) (13-9)(13+9)= 4*22= 88
2) (20-19)(20+19)= 1*39= 39
3) (2,2-2,8)(2,2+2,8)= -0,6*5= -3
4) (3,5-3,7)(3,5+3,7)= -0,2*7,2= -1,44
13) (51-41)(51+41)= 10*92= 920
14) (54-46)(54+46)= 8*100= 800
15) (76-24)(76+24)= 52*100= 5200
16) (328-172)(328+172)= 156*500= 78000
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1) (13-9)(13+9)= 4*22= 88
2) (20-19)(20+19)= 1*39= 39
3) (2,2-2,8)(2,2+2,8)= -0,6*5= -3
4) (3,5-3,7)(3,5+3,7)= -0,2*7,2= -1,44
13) (51-41)(51+41)= 10*92= 920
14) (54-46)(54+46)= 8*100= 800
15) (76-24)(76+24)= 52*100= 5200
16) (328-172)(328+172)= 156*500= 78000