Question

помогите с проверкой внизу​

Answer 1

1) 4х+72х+90=850

76х=850-90

76х=760

х=760:76

х=10

4*10+72*10+90=850

40+720+90=850

850=850

2) 450:(4у-у)=3

450:3у=3

3у=450:3

3у=150

у=150:3

х=50

450:(4*50-50)=3

450:150=3

3=3