Question

Oi a pergunta é assim
a) 29a + 4a - 21a

b) x + 3x - x + 5x - x

c) c) 3x + 4x³ – 5x + x² + 2x

o resto ta na foto preciso das respostas da numero 1)

Answer 1

Explicação passo-a-passo:

a)

$\sf 29a+4a-21a$

$\sf =33a-21a$

$\sf =\red{12a}$

b)

$\sf x+3x-x+5x-x$

$\sf =4x+4x-x$

$\sf =8x-x$

$\sf =\red{7x}$

c)

$\sf 3x+4x^3-5x+x^2+2x$

$\sf =4x^3+x^2+3x-5x+2x$

$\sf =4x^3+x^2-2x+2x$

$\sf =\red{4x^3+x^2}$

d)

$\sf \dfrac{3y}{4}-\dfrac{y}{5}+\dfrac{7y}{2}$

$\sf mmc(4,5,2)=20$

$\sf \dfrac{3y}{4}-\dfrac{y}{5}+\dfrac{7y}{2}$

$\sf =\dfrac{3y\cdot5-y\cdot4+7y\cdot10}{20}$

$\sf =\dfrac{15y-4y+70y}{20}$

$\sf =\dfrac{11y+70y}{20}$

$\sf =\red{\dfrac{81y}{20}}$

e)

$\sf 4a+5b+\dfrac{7a}{2}-b$

$\sf =4a+\dfrac{7a}{2}+5b-b$

$\sf =\dfrac{4a\cdot2+7a}{2}+4b$

$\sf =\dfrac{8a+7a}{2}+4b$

$\sf =\red{\dfrac{15a}{2}+4b}$