Odpowiedzi

2009-12-13T16:48:53+01:00
4(x - 2) + 2(7 - x) =4x-8+14-2x=2x+6
x(y - 4) + 2(xy - 30)=xy-4x+2xy-60=3xy-64
3a(b - 3) - 2b(a -3)=3ab-9a-2ba+6b=ab-9a+6b
3a - (a + 1)= 3a-a-1= 2a-1
1 5 1
2009-12-13T16:51:55+01:00
1) 4(x-2)+2(7-x)=4x-8+14-2x=2x+6
2)x(y-4)+2(xy-30)=xy-4x+2xy-60=3xy-4x-60
3)3a(b-3)-2b(a-3)=3ab-9a-2ab-6b=ab-9a-2ab
4)3a-(a+1)=3a-a-1=2a-1
2009-12-13T16:54:48+01:00
4x-8+14-2x= 2x+6

1xy-4x+2xy-60= 3xy-4x-60

3ab-9a-(2ab-6b)= 3ab-9a-2ab+6b

3a-a-b= 2a-b