Question

(ab + 7)(8 - ab);
(1,5-6nm) (8nm + 2,5);
2) (xy +11) (xy-12);
4) (9st - 1,6) (10 + 1,8st)
Решите пж даю 30 б​

Answer 1

$ab - a {}^{2} b {}^{2} + 56$

$- 3mn + 3.75 - 48m {}^{2} n {}^{2}$