①234+457+209
②39+3×9
③200-360÷9
④830-(456+128)
⑤649-(832-563)
⑥56÷(50-42)
①12.5×(8+0.8)
②+×
③+÷
④26﹣7.28﹣12.72
⑤5.8×4.1+5.9×5.8
⑥÷(+1.4×)
①54×98
②(+﹣)×24
③4.86×[1÷(2.1﹣2.09)]
④8﹣