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Sagot :
A = 2*2 = 4
B = 4*2 + 5
= 8+5
= 13
C = 4(2-3)(2+8)
= 4*(-1)*10
= -4*10
= -40
D = 3*2 - 2(5*2-15)
= 6 - 2(10-15)
= 6+2*5
= 6+10
= 16
E = 9*2²
= 9*4
= 36
B = 4*2 + 5
= 8+5
= 13
C = 4(2-3)(2+8)
= 4*(-1)*10
= -4*10
= -40
D = 3*2 - 2(5*2-15)
= 6 - 2(10-15)
= 6+2*5
= 6+10
= 16
E = 9*2²
= 9*4
= 36
a = 2x = 2*2 =4
b = 4x+5 = 4*2 +5 = 8+5 =13
c =4 (x-3)(x+8) = 4 ( 2-3) (2+8) = 4(-1) (10) = 4(-10) = -40
d = 3x-2(5x-15) = 3 *2 -2(5*2-15) =6 -2(10-15) = 6 -2(-5) =6 +10 = 16
e = 9x² = 9(2)² = 9*4 =36
f = 7-2x = 7-2*2 = 7-4 = 3
g = 2 (3x-2) = 2(3*-2-2) = 2 (-6-2)=2 (-8)= -16
h = x (x+2) -4x = 2 (2+2) -4(2) = 2(4) -8 = 8-8 =0
i = 4x²-2x (4-x) = 4(2)² -2*2(4-2) =4(4) -4(2) =16-8 =8
j = -3x²+5x -4 = -3(2)² +5 (2) -4 = -3(4) +10 -4 = -12+10-4 = -6
b = 4x+5 = 4*2 +5 = 8+5 =13
c =4 (x-3)(x+8) = 4 ( 2-3) (2+8) = 4(-1) (10) = 4(-10) = -40
d = 3x-2(5x-15) = 3 *2 -2(5*2-15) =6 -2(10-15) = 6 -2(-5) =6 +10 = 16
e = 9x² = 9(2)² = 9*4 =36
f = 7-2x = 7-2*2 = 7-4 = 3
g = 2 (3x-2) = 2(3*-2-2) = 2 (-6-2)=2 (-8)= -16
h = x (x+2) -4x = 2 (2+2) -4(2) = 2(4) -8 = 8-8 =0
i = 4x²-2x (4-x) = 4(2)² -2*2(4-2) =4(4) -4(2) =16-8 =8
j = -3x²+5x -4 = -3(2)² +5 (2) -4 = -3(4) +10 -4 = -12+10-4 = -6
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