Question

реши уравнения 30-х=20,х+1=40,у-8=7

Answer 1

30-х=20
Х=30-20
X=10
30-10=20

Х+1=40
X=40-1
Х=39
39+1=40

У-8=7
У=7+8
У=15
15-8=7