Which number do you want to fill in next? 22 36 40 56 68 The answer is 90, but I can't find a way,

Which number do you want to fill in next? 22 36 40 56 68 The answer is 90, but I can't find a way,

The first number plus half of the second number equals the third number
22+36/2=40
36+40/2=56
40+56/2=68
56+68/2=90
The answer is 90

4:9 to 1:6 is equal to X to 15. How to calculate? Write the formula to give points

4/9:1/6=x:15
15*4/9=1/6*x
x=40

A simple method of 0.625 times 1 and 1 / 4 plus 3 / 8 times 1.75

0.625 x 1 and a quarter + 3 / 8 x 1.75 = 5 / 8 x 5 / 4 + 3 / 8 x 7 / 4 = (1-3 / 8) x 5 / 4 + 3 / 8 x 7 / 4 = 5 / 4 - 3 / 8 x 5 / 4 + 3 / 8 x 7 / 4 = 5 / 4 + (7 / 4 - 5 / 4) x 3 / 8 = 5 / 4 + 1 / 2 x 3 / 8 = 20 / 16 + 3 / 16 = 23 / 16

Solving the equation (M & # 178; - M) x & # 178; - (2m & # 178; - 1) x + m (M + 1) = 0

The equation can be reduced to:
（mx-m-1）[(m-1)x-m]=0
So, x = (M + 1) / m, M is not equal to 0;
X = m / (m-1), M is not equal to 1
I wish: progress in learning!

(1) What's the product of the quotient of 18 divided by 108 multiplied by the difference between 54 and 48? (2), 200 minus 110 is divided by 12 and 6
(1) What is the product of the quotient of 18 divided by 108 times the difference between 54 and 48?
(2) What's the quotient of 200 minus 110 divided by the sum of 12 and 6?

108÷18×(54-48)
=6×6
=36
(200-110)÷(12-6)
=90÷6
=15

A 52cm long wire can be used to weld a 6cm wide and 4cm long rectangular teaching aid. What is its height?

(52-(6+4)*4)/4=3 cm
3 cm high

An integer division problem! The known quotient is 17! The remainder is 25! What is the minimum divisor? When the divisor takes the minimum number! What is the divisor?

The divisor is 26 and the divisor is 477

The sum of the first n terms of the sequence 1 / (n-178; - 1) is determined by the split term method

1/(n^2-1)=1/2x[1/(n-1)-1/(n+1)]

(- 3) 2 * (- 1.22) / (- 0.3) 3 the inverse of the square of negative three multiplied by the square of 1.2 divided by the inverse of negative zero three

Is the title like this?
（-3）²*（-1.2）²/(-0.3)³=-480
I hope I can help you,

If the lines (3a + 2) x + (1-4a) y + 8 = 0 and (5a-2) x + (a + 4) Y-7 = 0 are perpendicular to each other, find the value of A

∵ the lines (3a + 2) x + (1-4a) y + 8 = 0 and (5a-2) x + (a + 4) Y-7 = 0 are perpendicular to each other. If the lines a1x + b1y + C1 = 0 and a2x + b2y + C2 = 0 are perpendicular, then (3a + 2) (5a-2) + (1-4a) (a + 4) = 0 can be obtained, and 11a2-11a = 0 can be obtained by simplification. The solution is a = 0, or & nbsp; a = 1