加减乘除都可以,-1,3,7,-9?

问题描述:

加减乘除都可以,-1,3,7,-9?

1: (1 + 7) ÷ 3 × 92: ((1 + 7) ÷ 3) × 93: (1 + 7) ÷ (3 ÷ 9)4: (1 + 7) × 9 ÷ 35: ((1 + 7) × 9) ÷ 36: (1 + 7) × (9 ÷ 3)7: (7 + 1) ÷ 3 × 98: ((7 + 1) ÷ 3) × 99: (7 + 1) ÷ (3 ÷ 9...