Question

sustituye la a por el numero entero que haga que la igualdad sea cierta



si no saben no respondan ​

Answer 1

Respuesta:

a. (-15) (- 5)

b. - 18 - 16

c. 17 - (-2)

d. 6 - 66

Answer 2

Respuesta:

a)

$\left(-15\right)\left(-8+3\right)=\left(-15\right)a\\\\\\\left(-15\right)a=\left(-15\right)\left(-8+3\right)\\\\\\\left(-15\right)a=-15\left(-8+3\right)\\\\\\\left(-15\right)a=-15\left(-5\right)\\\\\\\left(-15\right)a=15\cdot \:5\\\\\\\left(-15\right)a=75\\\\\\\frac{\left(-15\right)a}{-15}=\frac{75}{-15}\\\\\\a=-5$

b)

$\frac{12}{6\left(-9\right)+\left(-2\right)\cdot \:8}=a-16\\\\\\a-16=\frac{12}{6\left(-9\right)+\left(-2\right)\cdot \:8}\\\\\\a-16=\frac{12}{-6\cdot \:9-2\cdot \:8}\\\\\\a-16=\frac{12}{-70}\\\\\\a-16=-\frac{12}{70}\\\\\\a-16=-\frac{6}{35}\\\\\\a-16+16=-\frac{6}{35}+16\\\\\\a=\frac{554}{35}$

c)

$\frac{17-\left(18-12\right)}{\left(-3\right)}=17-a\\\\\\\frac{17-\left(18-12\right)}{-3}+a=17-a+a\\\\\\-\frac{11}{3}+a=17\\\\\\-\frac{11}{3}+a+\frac{11}{3}=17+\frac{11}{3}\\\\\\a=\frac{62}{3}$

d)

$6-4\cdot \:9+30=6-a\\\\\\6-4\cdot \:9+30-6=6-a-6\\\\\\-4\cdot \:9+30=-a\\\\\\-4\cdot \:9+30+a=-a+a\\\\\\a-6=0\\\\\\a=6$