qui peut m'aider ? merci

a)
A = 2(3-4)²+0.1³
A = 2*(-1)² + 0.001
A = 2*1 +0.001
A = 2.001

B = -4² +5x3^-1 (^ se lit puissance)
B = 16 + 5/3 ou B = -16 + 5/3
B = 3*16/3 +5/3 ou B = 3*-16/3 +5/3
B = 48/3 +5/3 ou B = -48/3 +5/3
B = 53/3 ou B = -43/3
B = 17.66 ou B = -14.33

C = (20*3² - (5*2)³)/(2*10^4)   (^ se lit puissance)
C = (20*9 - 10³)/(2*10 000)
C = (180 - 1000)/2000
C = -820/20000
c = -410/10000
C = -41/1000
C = -0.041

b) E = 2x³ - 4x² - x + 5
x= 1
E = 2*1³ - 4*1² -1 + 5
E = 2-4-1+5
E = 2

x = -7
E = 2*-7³ -4*(-7)² -(-7) + 5
E = 2*-343 -4*49 + 7 + 5
E = -686 - 196 + 12
E = -870