1.9999x7+1111x37

3.654321x123456-654322x123455
=654321*(123455+1)-(654321+1)*123455
=654321*123455+654321-654321*123455-123455
=654321-123455
=530866

1.
1111×（9×7+1×37）=1111×（63+37）=1111×100=111100
2.
1/78×13 + 1/17×13 + 4/17
=1/6 + 1
=7/6
第三个不会

1.=1111*9*7+1111*37=1111*(63+37)=1111*100=111100
2.=13/78+13/17+4/17=1/6+(13+4)/17=1/6+1=7/6
3.=(654322-1)*123456-654322*(123456-1)
=654322*123456-123456-654322*123456+654322
=654322-123456=??????