简便运算 1001+25.5*999+510

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简便运算 1001+25.5*999+510
简便运算 1001+25.5*999+510

简便运算 1001+25.5*999+510
1001+25.5*999+510
=1000+1+25.5*(1000-1)+510
=1000+25.5*1000-25.5+511
=1000(1+25.5)-25.5+511
=26500+511-25.5
=27011-25.5
=26985.5

1001+25.5*999+510
=1001+510+25.5*1000-25.5
=1511+25000-25.5
=26511-25.5
=25485.5