口算。8+5=7+6=8+4=7+5=8+7=7+9=

口算。4E7Z2{'];N*\4P

8+5=*@(g-j1[+I-p-a8d1m1[/z*f                          7+6=)]:~-H(d4g7|:Q*u5@3T-o:W4E7Z2{'];N*\4P

8+4=*a9W:v9{,u(V.t1w2y1E:~'s8t                          7+5=4p:o/A:z+A3e8p2w+S,k*U(c4Y4E7Z2{'];N*\4P

8+7=+[*D9P3p.u/t7A4?3x                          7+9=5G,Q,z(O2g/D.B/h-O:q1D9X8P'},G5H4E7Z2{'];N*\4P

8+8=*R2U:n6n'G'D'A-?5W5}/A0~(K*y                          7+4=-U'A,l6l)V7^'H'O.I.r-['Z9T4E7Z2{'];N*\4P

8+9=9b4G4^-o4B3i1G.x6l1B                          7+8=,y'Y-l-F/J5c'f'E-Z4N'U8r4E7Z2{'];N*\4P