比一比，算一算。1+3=3+1=2+3=3+

比一比，算一算。-H.j2{6j+{3|1a3F-S

1+3=+e5v.y+J9M  3+1=-?;[1U3A  2+3=5b9?3^*~2n+b:u9W'c7H.t  3+2=.S/z,x2?1T4p)|3m7u3H-H.j2{6j+{3|1a3F-S

0+2=+Q+n'k.\0?:s  2+0=8Z'_0P.L5V5Q7Q8f6o2B9t8`-B,g:^)R.J6[  4+1=3O9L5s4`1?1K5\+Q:[;Q(p2o.j'h7q;y  1+4=-]9V0J2b)h9B4^-H.j2{6j+{3|1a3F-S