12345x17+23x12345+12345+12345x35+12345x24
=12345x17+23x12345+12345x1+12345x35+12345x24
=12345x(17+23+1+35+24)
=12345x100
=1234500
k cho minh nha
12345*17+23*12345+12345*35+12345*24
=12345*(17+23+35+34)
=12345*109
=1345605
ta có:
12345x17+23x12345+12345+ 12345x35+12345x24
= 12345 x ( 17+23+1+35+24)
= 12345x 100
=1234500