(5.863)2−(4.137)2(7.2)2−(2.8)2=
0.31
0.38
0.48
0.34
0.39
(5.863)2−(4.137)2(7.2)2−(2.8)2=(5.863+4.137)(5.863−4.137)(7.2+2.8)(7.2−2.8)=0.39