Question

Решите уравнен
3520+?=14000
4020-?=980

Answer 1

3520+x = 14000
x = 14000 - 3520
x = 10480

4020 - x = 980
x = 4020 - 980
x = 3040

Answer 2

3520+х=14000
х=14000-3520
х=10480

4020-х=980
х=4020-980
х=3040