Question

Помогите решить уравнение 70-а=8+9+2
а+(45-30)=75
×-(23+17)=60
(30-15)+у=80
×+12=50-(15+5)

Answer 1

1. 70 - а = 8 + 9 + 2

70 - а = 19

а = 70 - 19

а = 51

2. а + ( 45 - 30 ) = 75

а + 15 = 75

а = 75 - 15

а = 60

3. х - ( 23 + 17 ) = 60

х - 40 = 60

х = 60 + 40

х = 100

4. ( 30 - 15 ) + у = 80

15 + у = 80

у = 80 - 15

у = 65

5. х + 12 = 50 - ( 15 + 5 )

х + 12 = 50 - 20

х + 12 = 30

х = 30 - 12

х = 18.