2.14×8.2+7.86×8.2
=8.2×(2.14+7.86)
=8.2×9
=73.8
①70.8-1.25-1.75
②(8+0.8)×1.25
③21-(3.41+13.8)
④12.5×5.6×0.8
⑤4.1×2.6+2.6×5.9