Question

Calculati rapid,folosind formule de calcul prescurtat:
a) 98^2-2^2=
b) 994^2-6^2=
c)93*107=(100-7)(100+7)=...
d)192*208=

Answer 1

    
[tex]a)~98^2-2^2= (98-2)(98+2)=96 \times 100=\boxed{9600} \\ b)~994^2-6^2=(994-6)(994+6)=988 \times 1000=\boxed{998000} \\ c)~93 \times 107=(100-7)(100+7)=100^2-7^2 = 10000-49 =\boxed{9951} \\ d)~192*208= (200-8)(200+8)=200^2-8^2= 40000-64=\boxed{39936}[/tex]