1) (x - 4a)(5a + 8x) – (6a – 7x)(3x – 2a);
2 2
-59ax- 29x - 8a
2) (6c + d)(80 – 9d) + (-10d + 2c)(11c - 4d);
480c-172cd+80d+31d +22c
3) ( b- 5k)(6k – 0,3b) – (3k + b)(66 - 1,8k);
2
36x- 9.8b-30kx+3.3dk-24k+5.4k
1) (x - 4a)(5a + 8x) – (6a – 7x)(3x – 2a);
2 2
-59ax- 29x - 8a
2) (6c + d)(80 – 9d) + (-10d + 2c)(11c - 4d);
2 2
480c-172cd+80d+31d +22c
3) ( b- 5k)(6k – 0,3b) – (3k + b)(66 - 1,8k);
2
36x- 9.8b-30kx+3.3dk-24k+5.4k