题目<br>答案解析<br>查看更多优质解析<br>举报<br>1: 4 × (9 + 9 - 12)<br>2: 4 × ((9 + 9) - 12)<br>3: 4 × (9 + (9 - 12))<br>4: 4 × (9 - 12 + 9)<br>5: 4 × ((9 - 12) + 9)<br>6: 4 × (9 - (12 - 9))<br>7: (4 - 12 ÷ 9) × 9<br>8: (4 - (12 ÷ 9)) × 9<br>9: 9 × (4 - 12 ÷ 9)<br>解析看不懂?求助智能家教解答<br>查看解答<br>更多答案(1)<br>相似问题