Question

5) 22. Aflaţi termenul necunoscut x din: a) 813 - x=214; d) 400 - (20 + 30 + x) = 100; b) 118 - x + 90 = 121; e) 80 + x - 40 + 70 = 435; c) r - 15 - 2 = 25;
1) 25 +r - 10+x=45. ​

Answer 1

a)

$813 - x = 214$

$- \times = 214 - 813$

$- x = - 599$

d)

$400 - (20 + 30 + x) = 100$

$400 - 20 + 30 + x = 100$

$- 20 + 30 + x = 100 - 400$

$- 20 + 30 + x = - 300$

$30 + x = - 300 + 20$

$30 + x = - 280$

$x = - 280 - 30$

$x = - 310$

b)

$118 - x + 90 = 121$

$- x + 90 = 121 - 118$

$- x + 90 = 3$

$- x =3 - 90$

$- x = - 87$

e)

$80 + x - 40 + 70 = 435$

$x - 40 + 70 = 435 - 80$

$x - 40 + 70 = 353$

$x + 70 = 353 + 40$

$x + 70 = 393$

$x = 393 - 70$

$x = 323$

c)

$r - 15 - 2 = 25$

$r -15 = 25 + 2$

$r - 15 = 27$

$r= 27 + 15$

$r= 42$

f)

$25 + r - 10 + x = 45$

$25 + 42 - 10 + x = 45$

$42 - 10 + x = 45 - 25$

$42 - 10 + x = 20$

$- 10 + x = 20 - 42$

$- 10 + x = - 22$

$x = - 22 + 10$

$x = - 10$

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