1.9999x7+1111x372.(78分之1+17分之1)x13+4/173.654321x123456-654322x123455

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1.9999x7+1111x372.(78分之1+17分之1)x13+4/173.654321x123456-654322x123455
1.9999x7+1111x37
2.(78分之1+17分之1)x13+4/17
3.654321x123456-654322x123455

1.9999x7+1111x372.(78分之1+17分之1)x13+4/173.654321x123456-654322x123455
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=??????