Question

х+40=100,100-х=40,х-40=60,решить уравнения

Answer 1

1.х=100-40
Х=60

2.100-х=40
Х=100-40=60

3.Х+40=60
  х=60+40=100

Answer 2

1.×+40=100
×=100-40
×=60
2.100-×=40
×=100-40
×=60
3.×-40=60
×=60+40
×=100