The following questions add appropriate brackets to make the equation hold: 24 + 12 △ 4-1 × 2 = 18, 24 + 12 △ 4-1 × 2 = 30?

The following questions add appropriate brackets to make the equation hold: 24 + 12 △ 4-1 × 2 = 18, 24 + 12 △ 4-1 × 2 = 30?

（24+12）/4-1*2=18 24+【12/（4-1*2）】=30

Fill in the same number in the horizontal line to make the equation true______ -______ ×15=18．

Let this number be x, then: & nbsp; & nbsp; 24x-15x = 18, (24-15) x = 18, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 9x = 18, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 2. Therefore, 24 × (2) - (2) × 15 = 18

According to the rule, fill in the correct numbers 1, 2, 6, 30210, ()

1,2,6,30,210,（2310） .
The latter is the former multiplied by the prime respectively
2＝1*2
6＝2*3
30＝6*5
210＝30*7
2310＝210*11