89+91+90+92+88+87+93+92+87.

问题描述:

89+91+90+92+88+87+93+92+87.

89+91+90+92+88+87+93+92+87
=(89+91)+(92+88)+(93+87)+(92+87)+90,
=180+180+180+179+90,
=180×3+179+90,
=540+179+90,
=719+90,
=809.
答:算式的结果是809.