Question

(х+5)×□=3x+15,(□-у)×8=40-□.​

Answer 1

1.3

2.5

3.8у

Значения в квадратах

Answer 2

$1)\; \; (x+5)\cdot \circ =3x+15\\\\(x+5)\cdot 3=3x+15\\\\\\2)\; \; (\circ -y)\cdot 8=40-\circ \\\\(5-y)\cdot 8=40-8y$