The square of 4 plus the third power of 4 plus the fourth power of 4 plus the fifth power of 4 plus all the way up to the nth power of 4

In this topic, A1 is 16, q = 4, so we get - 16 / 3 (1-4 ^ n)

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3. One, half, one-third, one-fourth, one-fifth, one sixth. The number 1000 is
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5. One and a half by one and a third by one and a quarter. By one and a 99
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7. Simple calculation: (1-half) x (1-third) x (1-quarter) x (1-fifth) x.x (1-208)=
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9. One by half plus two by one-third plus three by one-quarter. Plus two thousand four by two thousand five is equal to?
10. (COS a) minus (sin a) =?
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14. （x²+4x）-（y²-4y）
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20. Several mathematics problems, seek the big God solution! 1、 Fill in the loop section at the right place, and the following formula holds 2.345＞2.345＞2.345＞2.345 0.613＜ 0.613＜ 0.613＜ 0.613 2、 If the quotient is 2.6, the remainder is (); if the quotient is 5600 △ 500, if the quotient is 11, the remainder is () What rules do you find? 1÷9=0.1... 2÷9=0.2... 3÷9=0.3... 4÷9=0.4... 5÷9=0.6... 6÷9=0.6... A: I found out_________________________________________________________ .