Question

реши уравнения: 35+23+х=100; 70-а=8+9+2; а+(45-30)=75

Answer 1

1) 35+23+х=100
х=100-35-23
х=42
2) 70-а=8+9+2
70-а=19
70-19=а
51=а
3) а+(45-30)=75
а+15=75
а=75-15
а=60