Упростить. 3a+3b+3c 2x+2y+2z 6a+3b+3c 3a+3b+6c
1 3(а+b+c) 2 2(x+y+z) 3 6(a+b+c) 4 3(a+b+3c)
3(a+b+c) , 2(x+y+z). , 3(3a+b+c). , 3(a+b+3c).