Question

Реши уравнения. Х+7•4=40. 6•3+X=72. 80-X=9•5. 12+X=5•8

Answer 1

$x + 7 times 4 = 40$
$x + 28 = 40$
$x = 40 - 28$
$x = 12$
$6 times 3 + x = 72$
$18 + x = 72$
$x = 72 - 18$
$x = 54$
$80 - x = 9 times 5$
$80 - x = 45$
$- x = 45 - 80$
$- x = - 35$
$x = 35$
$12 + x = 5 times 8$
$12 + x = 40$
$x = 40 - 12$
$x = 28$