在每个方框中填入加(＋)、减(－)、乘(×)、除(÷)符号,算出正确答案,三个算式结果是一样的.你能算得出来不?

6 + 7 - 7 - 3 - 1 = 2
7 + 4 + 3 - 2 * 6 = 2
8 - 3 - 6 / 4 * 2 = 2
6 + 7 - 7 - 3 * 1 = 3
7 - 4 + 3 * 2 - 6 = 3
8 + 3 - 6 - 4 + 2 = 3
6 + 7 - 7 - 3 + 1 = 4
7 + 4 - 3 + 2 - 6 = 4
8 - 3 / 6 * 4 - 2 = 4
6 - 7 / 7 + 3 - 1 = 7
7 + 4 * 3 - 2 * 6 = 7
8 + 3 - 6 + 4 - 2 = 7
6 + 7 - 7 + 3 - 1 = 8
7 + 4 * 3 / 2 * 6 = 8
8 + 3 - 6 / 4 * 2 = 8
6 + 7 - 7 + 3 * 1 = 9
7 * 4 / 3 - 2 / 6 = 9
8 + 3 + 6 - 4 * 2 = 9
6 + 7 - 7 + 3 + 1 = 10
7 + 4 + 3 + 2 - 6 = 10
8 * 3 - 6 - 4 * 2 = 10
6 + 7 / 7 + 3 + 1 = 11
7 + 4 + 3 * 2 - 6 = 11
8 + 3 + 6 - 4 - 2 = 11
6 + 7 + 7 - 3 - 1 = 16
7 + 4 - 3 + 2 + 6 = 16
8 * 3 - 6 - 4 + 2 = 16
6 + 7 + 7 - 3 * 1 = 17
7 * 4 - 3 - 2 - 6 = 17
8 + 3 * 6 / 4 * 2 = 17
6 + 7 + 7 - 3 + 1 = 18
7 + 4 + 3 - 2 + 6 = 18
8 + 3 * 6 - 4 * 2 = 18
6 - 7 + 7 * 3 - 1 = 19
7 + 4 * 3 / 2 + 6 = 19
8 + 3 + 6 + 4 - 2 = 19
6 - 7 + 7 * 3 * 1 = 20
7 + 4 + 3 / 2 * 6 = 20
8 + 3 * 6 - 4 - 2 = 20
6 - 7 + 7 * 3 + 1 = 21
7 * 4 - 3 + 2 - 6 = 21
8 * 3 - 6 / 4 * 2 = 21
6 + 7 + 7 + 3 - 1 = 22
7 + 4 + 3 + 2 + 6 = 22
8 * 3 + 6 - 4 * 2 = 22
6 + 7 + 7 + 3 * 1 = 23
7 + 4 + 3 * 2 + 6 = 23
8 + 3 + 6 + 4 + 2 = 23
6 * 7 - 7 - 3 - 1 = 31
7 + 4 * 3 + 2 * 6 = 31
8 - 3 + 6 * 4 + 2 = 31
6 + 7 + 7 * 3 - 1 = 33
7 * 4 - 3 + 2 + 6 = 33
8 + 3 + 6 * 4 - 2 = 33
6 * 7 - 7 + 3 - 1 = 37
7 + 4 * 3 * 2 + 6 = 37
8 + 3 + 6 * 4 + 2 = 37