X-one third [x-one third (X-9)] = one ninth (x + 9) + 2

X-one third [x-one third (X-9)] = one ninth (x + 9) + 2

X-one third [x-one third (X-9)] = one ninth (x + 9) + 2
9x-3 [x-one third (X-9)] = x + 9 + 18
9x-3x+x-9=x+27
6x=36
x=6

What is 2 and one-third plus (5.4-x) multiplied by 1 and two-thirds divided by 3 and four ninths = 2 x

{7 / 3 + (5.4-x) * 5 / 3} / 31 / 4 = 2 7 / 3 + (5.4-x) * 5 / 3 = 8 / 31 7 + (5.4-x) * 5 = 24 / 31 7 / 5 + (5.4-x) = 24 / 155 7 / 5 + 27 / 5-x = 24 / 155 x = 7 / 5 + 27 / 5-24 / 155 x = 1030 / 155 = 206 / 31, about equal to 6.65

(x + 1) ^ 2-4 divided by x ^ 2 + x ^ 2-9=

(x + 1) ^ 2-4 divided by x ^ 2 + x ^ 2-9
=[（x-1)²-4]/(x+1)²÷(x²-9)/(x²+x)
=(x²-2x+1-4)/(x+1)²÷(x²-9)/(x²+x)
=(x-3)(x+1)/(x+1)²*[x(x+1)/(x-3)(x+3)]
=x /(x+3)

What is the sum of 5 / 8 of 56 plus 12 divided by 4 / 5

According to the meaning of the title:
56×(5/8) + 12÷(4/5)=35+ 12×(5/4)=35+15=50
And 50

21.56 minus the product of 7.63 and 1.37, what is the difference divided by 4

（21.56-7.63×1.37）÷4
=(21.56-10.4531）÷4
=11.1069÷4
=2.776725

A six digit number 23 □ 56 □ is a multiple of 88. The quotient of this number divided by 88 is______ Or______ ．

If a number is a multiple of 88, the number must be a multiple of both 8 and 11. According to the multiple of 8, its last three digits must also be a multiple of 8, so we can know that the number on the single digit of the six digit is 0 or 8; according to the multiple of 11, the difference between the sum of the odd and even digits should be a multiple of 0 or 11

According to the law of constant quotient, write out the formula so that their quotient is the same as the given formula: 72 divided by 8, 56 divided by 8, 63 divided by 7

72 divided by 8 = 36 divided by 4 = 18 divided by 2 = 9 divided by 1
56 divided by 8 = 28 divided by 4 = 14 divided by 2 = 7 divided by 1
63 divided by 7 = 9 divided by 1 = 126 divided by 14 = 27 divided by 3 and so on

30 divided by 160 = () divided by 16 = 1.5 divided by ()

30 divided by 160 = (3) divided by 16 = 1.5 divided by (8)

Take the quotient of 30 divided by 5 and remove 180. What's the quotient?

180/（30/5）=30

The minute hand of xiaomeijia's clock is 6cm long. When the minute hand passes for 15 minutes, how many centimeters does its tip pass? What's its area?

15 / 60 of an hour in 15 minutes = 1 / 4
That is, it has passed 1 / 4 of a circle
The distance is 3.14 * 6 * 2 * (1 / 4) = 9.42 cm
Area 3.14 * 6 * 6 * (1 / 4) = 28.26 square centimeter