计算:3r4x5E7^+U8A*x5b;[
1000﹢999-998-997+996+995-994-993+…+108+107-106-105+104+103-102-1013r4x5E7^+U8A*x5b;[
算式:提示6M,l2l.x:a/V:e+w3r4x5E7^+U8A*x5b;[
=(h'},a6h(K,|,I;p3r4x5E7^+U8A*x5b;[