Question

Упростить выражения и найдите значение при x=1; -4; 2,5; -40
1) (5x-1) – ( 2-8x)
2) 37 – (x - 16)+(12x-1

Answer 1

Ответ:

1) (5x - 1) - (2 - 8x) = 5x - 1 - 2 + 8x = 13x - 3

x = 1 ; 13*1-3=10

x = -4; 13*(-4)-3= -52 - 3 = - 55

x = 2.5; 13*2.5-3=32.5 - 3 = 29.5

x = - 40; 13*(-40)= -520 - 3 = -523

2) 37 – (x - 16)+(12x-1) = 37 - x + 16 +12x - 1 = 52 + 11x

x = 1 ; 52 + 11*1= 63

x = -4; 52 + 11*(-4)= 52 - 44= 8

x = 2.5; 52 + 11*2.5= 52 + 27.5= 79.5

x = - 40; 52 + 11*(-40)= 52 - 440 = -388