7.91-0.85+2.09
23-0.34-1.66
54×0.25+7.5×5.4
8.7+7.83+0.17 78.2+17.47+21.85.6-0.74-1.26 7.31-3.06-3.31
①3.86+6.4+2.14+7.6
②5.2÷0.32﹣0.12
③()×15
④
⑤
⑥
①2.4÷×
②(+﹣)×36
③×99
④29.3﹣12.6﹣7.4
⑤5.9×8.5﹣49×0.85
⑥×[6÷(﹣)]