1994+997*997怎么巧算
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1994+997*997怎么巧算
1994+997*997怎么巧算
1994+997*997怎么巧算
=997X2+997X997
=997X(2+997)
=997X999
=997X1000-997
=997000-997
=996003
法一:
1994+997*997
=997X2+997X997
=997X(2+997)
=997X(1000-1)
=997X1000-997
=997000-997
=996000+1000-997
=996000+3
=996003
法二:1994+997*997
=1994+(1000-3)*(1000-3)
=1994+1000000-6000+9
=2003+994000
=996003