Question

5
Реши уравнения одни
2. (100 + х) = 400
200 + (b+400) = 1 000​

Answer 1

№1.

$(100 + x) = 400\\100 + x = 400\\x = 400 - 100\\x = 300$

№2.

$200 + (b +400) = 1000\\200 + b + 400 = 1000\\b + 600 = 1000\\b = 1000 - 600\\b = 400$