999+998+997+996+995简便运算

问题描述:

999+998+997+996+995简便运算

(1000-1)+(1000-2)+(1000-3)+(1000-4)+(1000-5)
=5000-(1+2+3+4+5)
=5000-15
=4985

999+998+997+996+995
=(1000-1)+(1000-2)+(1000-3)+(1000-4)+(1000-5)
=1000+1000+1000+1000+1000-1-2-3-4-5
=1000×5-(1+2+3+4+5)
=5000-15
=4985

999+998+997+996+995
=(1000-1)+(1000-2)+(1000-3)+(1000-4)+(1000-5)
=1000x5-1-2-3-4-5
=5000-15
=4985

1000*5-(1+2+3+4+5)=5000-15=4985

999+998+997+996+995
=1000-1+1000-2+1000-3+1000-4+1000-5
=5000-15
=4985