Explications étape par étape:
20)
A= x. (x+4)
= x²+4x
B= 7y(2-9y)
= 14y. -63y²
C= -2y. (5-y)
= -10y+ 2y²
D= (9-3t)*4t
= 36t-12t²
21)
A= 11+(2x-6)
= 11+2x-6
= 5+2x
B= -3(2y-4)-2y
= -6y+12-2y
= -8y+12
C= 7-4(8-2a)+a
= 7-32+8a+a
= 25+9a
D= -15-9(-5+3b)
= -15 +45-27b
= 30-27b
E= -5(6-3t)-9+z
= -30+15t-9+z
= -39+15t+z
F= 12x-4(6-3x)
= 12x-24+12x
= 24x-24
voila
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Explications étape par étape:
20)
A= x. (x+4)
= x²+4x
B= 7y(2-9y)
= 14y. -63y²
C= -2y. (5-y)
= -10y+ 2y²
D= (9-3t)*4t
= 36t-12t²
21)
A= 11+(2x-6)
= 11+2x-6
= 5+2x
B= -3(2y-4)-2y
= -6y+12-2y
= -8y+12
C= 7-4(8-2a)+a
= 7-32+8a+a
= 25+9a
D= -15-9(-5+3b)
= -15 +45-27b
= 30-27b
E= -5(6-3t)-9+z
= -30+15t-9+z
= -39+15t+z
F= 12x-4(6-3x)
= 12x-24+12x
= 24x-24
voila