3×309-972:4=684
3×309=927
972:4=243
927-243=684
(709-411):2×6= 894
709-411=298
298:2=149
149×6=894
268+609-566-97=214
268+609=877
877-566=311
311-97=214
1000-(651-169)+107= 625
651-169=482
1000-482=518
518+107=625
3×309-972:4=684
3×309=927
972:4=243
927-243=684
(709-411):2×6= 894
709-411=298
298:2=149
149×6=894
268+609-566-97=214
268+609=877
877-566=311
311-97=214
1000-(651-169)+107= 625
651-169=482
1000-482=518
518+107=625