87+87×25+73+87 怎么巧算啊?

问题描述:

87+87×25+73+87 怎么巧算啊?

87+87×25+73+87
=87×25+87×2+73
=87×27+73
=(8×3-1)×100+(7×7)+73
=2349+73
=2350+72
=2400+22
=2422
如果原题目是:
87+87×25+73×87
=87×(1+25+73)
=87 ×99
=87×(100-1)
=87×100-87
=8700-87
=8700-100+13
=8600+13
=8613