20*9-6:3=140 поставь скобки получилось 140
20*(9-6:3)=140
20*(9-2)=140
20*7=140
20*9-20*2=140
180-40=140
140=40
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20*(9-6:3)=140
20*(9-2)=140
20*7=140
20*(9-6:3)=140
20*(9-2)=140
20*9-20*2=140
180-40=140
140=40