①50+85÷5
②248÷4-15
③852÷6×5
④272÷(2×4)
①12.5×(8+0.8)
②+×
③+÷
④26﹣7.28﹣12.72
⑤5.8×4.1+5.9×5.8
⑥÷(+1.4×)