99999x77778+33333x66666=99999*77778+33333*3*22222=99999(77778+22222)=9999900000
66666=3*22222,5个2的来处
99999x77778+33333x66666
=99999x77778+33333x3x66666÷3
=99999x77778+99999x22222
=99999x(77778+22222)
=99999x100000
=9999900000
99999×77778 + 33333×66666
= 99999×77778 + 99999×22222
= 99999×(77778 + 22222)
= 99999×100000
= 9999900000
99999x77778+33333x66666
=99999x77778+33333x3*22222
=99999*(77778+22222)
=99999*100000
=9999900000
=9999900000