①674+126+192
②826-326-429
③100÷5-16
④125×(13-9)
①234+457+209
②39+3×9
③200-360÷9
④830-(456+128)
⑤649-(832-563)
⑥56÷(50-42)
①26×15﹣200
②8×4×12.5×0.25
③×+
④12÷[()×]