325 x 6+6 x 560+115 x 6
=(325+560+115) x 6
=1000 x 6
=6000
C1 325 x 6 + 6 x 560 + 115
= 1950 + 3360 + 115
= 5425
C2 325 x 6 + 6x560 + 115
= 6 x (325 + 560) + 115
= 6 x 885 + 115
= 5310 + 115
= 5425
325.6+6.560+115=6(325+560)+115
=6.885+115
=5310+115
=5425
bạn hiền ^_^