Question

123456789加减乘除填到9个方框里怎么看都等于4

Answer 1

1*2+3+4-5+6-7-8+9 = 4
1*2+3+4-5-6+7+8-9 = 4
1*2+3-4+5+6-7+8-9 = 4
1*2-3+4+5+6+7-8-9 = 4
1*2-3-4+5-6-7+8+9 = 4
1*2-3-4-5+6+7-8+9 = 4