ГДЗ Математика 5 клас Істер — Вправа 501

Розв'язання

1) $(x + 26) \cdot 12 = 360$
$x + 26 = 360 : 12$
$x + 26 = 30$
$x = 30 - 26$
$x = \mathbf{4};$

2) $7(x - 15) = 1841$
$x - 15 = 1841 : 7$
$x - 15 = 263$
$x = 263 + 15$
$x = \mathbf{278};$

3) $(132 - x) : 4 = 23$
$132 - x = 23 \cdot 4$
$132 - x = 92$
$x = 132 - 92$
$x = \mathbf{40};$

4) $910 : (x + 11) = 35$
$x + 11 = 910 : 35$
$x + 11 = 26$
$x = 26 - 11$
$x = \mathbf{15};$

5) $5(2x + 27) = 405$
$2x + 27 = 405 : 5$
$2x + 27 = 81$
$2x = 81 - 27$
$2x = 54$
$x = 54 : 2$
$x = \mathbf{27};$

6) $(5x + 2x) : 2 = 252$
$7x : 2 = 252$
$7x = 252 \cdot 2$
$7x = 504$
$x = 504 : 7$
$x = \mathbf{72}.$