两个数相加的和一定小于这两个数相乘的积. .
( )+351=652 125-( )=22
( )+325=561 641-( )=365 ( )-158=369 356+( )=515
( )+148=742 512-( )=259 ( )-201=125 456+( )=545
( )+261=975 618-( )=256 ( )-258=159 246+( )=589
( )+256=965 658-( )=215 ( )-125=29 457+( )=654