100 + 58 + 74-57 + 85 + 54 + 56 + 85-78 equals

100 + 58 + 74-57 + 85 + 54 + 56 + 85-78 equals

three hundred and seventy-seven

85.64.92.58.42.56.48. Which is the average

（85+64+92+58+42+56+48）/7≈64

Fill in the same number in the brackets below to make the equation hold. 24 × () + () × 16 = 18 () - 0.72 × () = 566.2 × () - () = 4.16 () × 13.2 + 1.8 × () = 66.6

1):　　24*（）+（）*16=18
2):　　（）-0.72*（）=56
3):　6.2*（）-（）=4.16
4):　（）*13.2+1.8*（）=66.6
Answer: 0.45 200 0.8 4.44

Given 6, 16, 56, 132, 250, (), find out the law and find the number in brackets

Quadratic arithmetic, this is very easy