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(ysquare + 2Y) (ysquare + 2Y + 2) + 1
(y^2+2y)(y^2+2y+2)+1
=(y ^ 2 + 2Y) ^ 2 + 2 (y ^ 2 + 2Y) + 1 calculate y ^ 2 + 2Y as a factor
=(y^2+2y+1)^2
=(y+1)^4
How to make the square of y-2y-y + 2
Y & # 178; - 2y-y + 2 = y & # 178; + (- 2-1) y + 2 = final result = y & # 178; - 3Y + 2
The ratio of a and B is 2:3, and the ratio of a and C is 6:7
A: B = 2:3 = 6:9
A: C = 6:7
So:
A: B: C = 6:9:7
It is known that the equation cos2x-2sinx + 2A + 1 = 0 about X has a solution in the interval (0, π / 2). The value range of real number a is obtained
Cos2x-2sinx + 2A + 1 = 01-2 (SiNx) ^ 2-2sinx + 2A + 1 = 02 (SiNx) ^ 2 + 2sinx = 2A + 2 (SiNx) ^ 2 + SiNx = a + 1 (SiNx) ^ 2 + SiNx + 1 / 4 = a + 1 + 1 / 4 = a + 5 / 4 (SiNx + 1 / 2) ^ 2 = a + 5 / 4 because the equation cos2x-2sinx + 2A + 1 = 0 has a solution in the interval (0, π / 2], so SiNx in the interval (0, π / 2) is
5 / 7 of a number equals 7 / 11, and 5 / 7 of another number equals 4 / 11. Find the sum of the two numbers
Sum = (4 / 11 + 7 / 11) △ 5 / 7 = 7 / 5
If x + 1 / 2 = y + 3 / 4 = x + Y / 5, find the value of 3x + 2Y + 1 / x + 2Y + 3
Answer: because x + 1 / 2 = x + Y / 5, 1 / 2 = Y / 5
So y = 2.5
And because x + 1 / 2 = y + 3 / 4 substitutes y = 2.5
X = 2.75
The value of X and Y is known, because 3x + 2Y + 1 / x + 2Y + 3 = 3x + 4Y + 1 / x + 3 is substituted into the value of X and y
3x2.75 + 4x2.5 + 1 / 2.75 + 3 = 13 + 37 / 11 = 16 + 4 / 11, which is 4 / 16 of 11
For processing a batch of parts, Party A will finish it in 20 days, and Party B will finish it in 30 days. After Party A and Party B have done it together for several days, Party B asks for leave because of something, and Party A continues to do it until the parts are processed. How many days does Party B ask for leave in 16 days from the start to the end of parts processing?
（1-1/20x16）÷1/30
=1/5÷1/30
=6 days
B ask for leave 16-6 = 10 days
Solution equation: 8x-1.6 = 19.2
8x = 1.6 + 19.2
8x = 8*0.2 + 8*2.4
8x = 8*(0.2 + 2.4)
x = 2.6
The solution x = 2.6
There are 3600 TV sets in warehouse A and B. If 15 sets are taken from warehouse A and put into warehouse B, the number of TV sets in warehouse A and B is equal. How many TV sets are there in warehouse A and B?
A: there are 2250 TV sets in warehouse A and 1350 TV sets in warehouse B
The solution equation is 0.06 + 7x = 0.72 × 3
0.06+7x=2.16
7x=2.16-0.06
=2.1
therefore
x=2.1/7=0.3
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