Question

Найдите значение выражения : (x-4)(x-2)-(x-1)(x-3) при x = 1 3/4
(a-5)(a-1)-(a+2)(a+3) при a= 2 3/5​

Answer 1

х²-2х-4х+8-(х²-3х-х+3)=х²-6х+8-х²+4х-3= -2х+5

-2*1 3/4+5= -2*7/4+5=5-3,5=1,5

а²-а-5а+5-(а²+3а+2а+6)=а²-6а+5-а²-5а-6= -11а-1

-11*2 3/5-1= -11*13/5-1= -143/5-1= -28 3/5-1= -29 3/5