Ответ:
\(8+7+2=8+2+7=10+7=17\); \(9+6=15\); \(46+4=50\); \(12+2+5=12+5+2=17+2=19\); \(32+30=62\); \(50+20=70\); \(17+3=20\); \(4+16=20\); \(50-20=30\).
\(8+7+2=8+2+7=10+7=17\); \(9+6=15\); \(46+4=50\); \(12+2+5=12+5+2=17+2=19\); \(32+30=62\); \(50+20=70\); \(17+3=20\); \(4+16=20\); \(50-20=30\).