①27+38+12
②83-46-24
③43+(56-24)
④85-(43-28)
38+29+30 87-30-42 68-(46-24)
①8×2.5×0.125÷
②(+﹣)×24
③6.5÷×
④(+)×+
⑤4×(﹣)×9
⑥÷7+×