Divide 9 / 14, 8 / 15 and 6 / 35 and compare the size

Divide 9 / 14, 8 / 15 and 6 / 35 and compare the size

9/14=135/210
8/15=112/210
6/35=36/210
9/14>8/15>6/35

11 = 8 7 = 4, fill in the appropriate operation symbols and brackets to make the formula true

1+ 1 +1 +1÷ 1=8 ÷（7÷ 7+ 7 ÷7）=4

The image of quadratic function y = a (X-H) ^ + k is determined by (- 2,0) and (4,0)

Because we know the coordinates of the two intersections with the x-axis,
So let y = a (x-x1) (x-x2)
Because over (- 2,0) and (4,0)
So X1 = 2, X2 = - 4
So y = a (x + 2) (x-4)
=a（x^2-2x-8）
=a（x-1）^2-7a
=a（x-h）^2+k
So h = 1
k=-7a

The sum of an integer and its reciprocal is equal to 20.05. What is the integer?

This number is an integer, so its reciprocal is less than 1
So this integer is the integral part of 20.05, which is 20

- 3 / 4 △ 3 / 4 - 9 / 14 × (- 3 / 1 / 2)

First remove the sign, the absolute value is positive, the bracket is the opposite number, the final direct calculation is simple

Simple calculation of 16 times 5 plus 34 times 5 plus 28

16×5+34×5+28
=（16+34）×5+28
=50×5+28
=250+28=278

How much does (A & # 178; + 1) &# 178; - 4 & # 178; equal? Factorize
As the title!

=[(a²+1)+2][(a²+1)-2]
=(a²+3)(a²-1)
=(a²+3)(a+1)(a-1)

(minus 8 and 3 / 7) plus (minus 7.5) plus (minus 21 and 4 / 7) plus (three and 1 / 2)

=-8-3/7-7.5-21-4/7+3.5
=-8-21-(3/7+4/7)+(3.5-7.5)
=-29-1-4
=-34

If the length of a cuboid is reduced by 4cm, it will become a cube. The surface area of the cube is 54cm2. What is the original surface area of the cuboid?

It can be close or close,
The area of each face of the cube is:
54 △ 6 = 9 (square centimeter)
Because 9 = 3 × 3, the edge length of a cube is 3 cm, and the length of a cuboid is:
3 + 4 = 7 (CM)
The surface area of the original cuboid is:
7 × 3 × 4 + 3 × 3 × 2 = 102 (cm2)

The sum of divisor, divisor, quotient and remainder is 93

Analysis: subtract the remainder 5 from 93, subtract the quotient 5, 83 is not 6 times, there is another 5, so subtract 5, then the remaining is 6 times the divisor, so divide 78 by 6 to get 13, which is the divisor. Then 13 * 5 + 5 = 70, which is the divisor
70/13=5…… five