53^2-31^2-43^2+41^2/73^2-2*73*63+63^2=(53^2-43^2)+(41^2-31^2)=(53-43)*(53+43)+(41-31)*(41+31)/(73-63)^2=(10*96+10*72)/10^2=10(96+72)/10^2=168/10=16,8
53^2-31^2-43^2+41^2/73^2-2*73*63+63^2=(53^2-43^2)+(41^2-31^2)=(53-43)*(53+43)+(41-31)*(41+31)/(73-63)^2=(10*96+10*72)/10^2=10(96+72)/10^2=168/10=16,8
==
(73-63)^2
(53-43)(53+43)+(41-31)(41+31)
==
100
10×96+10×72
==
100
=10(96+72)/100=168/10=16.8