Răspuns:
Va pot ajuta eu.
Explicație pas cu pas:
(a-100)-[80-2×(17+4×2)]:6=95
(a-100)-[80-2×(17+8)]:6=95
(a-100)-[80-2×(17+8)]=6×95
(a-100)-80-2×(17+8)=570
(a-100)-80-2×25=570
(a-100)-80-50=570
(a-100)-80 =570+50
(a-100)-80=620
a-100=700
a=800
72×2+9×(800-796):6-2×b=2
142+9×4:6-2×b=2
142+36:6-2×b=2
142+6-2×b=2
148-2×b=2
2b=148-2
2b=146
b=73