312 + (196 + 188) =
289 + (190 + 311) =
171 + (169 + 529) =
99 + (366 + 101) =
119 + (56 + 281) =
40 + (73 + 560) =
352 + 85 + 215 + 48 =
121 + 299 + 101 + 279 =
351 + 12 + 49 + 288 =
17 + (869 + 83) =
425+14+186=
282+41+156=
16+（161+14）=
36+（89+12+14）=
67+25+33+75=
75+168+25=
55+45+126=
64+36+44+56=
58+42+46=
49+51+69+31=
