Question

Afla termenul necunoscut:8supra9-(2supra 9+×)=5supra9;×-(1supra8+3supra8)=1;1-(×-3supra7)=2supra7;2supra5+(×-2supra5)=1.

Answer 1

8/9-(2/9+x)=5/9
2/9+x=8/9-5/9
2/9+x=3/9
x=3/9-2/9
x=1/9
x-(1/8+3/8)=1
x-4/8=8/8
x=4/8+8/8
x=12/8
x=3/2
1-(x-3/7)=2/7
x-3/7=7/7-2/7
x-3/7=5/7
x=3/7+5/7
x=8/7
2/5+(x-2/5)=1
x-2/5=5/5-2/5
x-2/5=3/5
x=2/5+3/5
x=5/5
x=1