2016 - 2006 + 126 + 123

= 10 + 126 + 123

= 136 + 123

= \(259\)

1)(5-x²).(x⁴+5x²+25)

2)15.(x-1)-(3x-1)

3)(x²-2)²

4)36x².(y-1)

5)(7-y).(z-x)

6)(x+3).(x+5)

7)(x-10).(x+2)

8)(x+5).(3y+1)

9)(-(y-x-3)).(y-x+3)

10)(11-x).(y+x)

11)(y-x+3)).(y+x-3)

12)(-(y+2x-5)).(y+2x+5)

13)4.(tz+y²+(-x).y-t²

14)(8-x).(y-x)

11 nha bạn

=12 nha bn

255+314=569

915+215=1130

780-218=562

12+8+9+10=39

20+30+20+20=90 nha bn k cho mình mình k lại nhé