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How to solve 21 + 26-x + 17 = 50
21+26-x+17=50
64-x=50
x=64-50
x=14
The calculation method of 4-order determinant,
1 2 3 4
2 3 4 1
3 4 1 2
4 1 2 3
Step 1: add columns 2, 3 and 4 to column 1, propose the common factor 10 of column 1, and change it into
1 2 3 4
1 3 4 1
1 4 1 2
1 1 2 3
Step 2: multiply the first line by - 1 and add it to the other lines
1 2 3 4
0 1 1 -3
0 2 -2 -2
0 -1 -1 -1
Step 3: R3 - 2r1, R4 + R1
1 2 3 4
0 1 1 -3
0 0 -4 4
0 0 0 -4
So determinant = 10 * (- 4) * (- 4) = 160
Simple algorithm of 0.72 divided by 0.08-1.5 multiplied by 4
The first is 9, the second is 6, and the third is 3
1 / (SiNx) ^ 2-1 / x ^ 2, what is the limit of X tending to zero and how to calculate it
Happy Chinese New Year! 1. The answer on the floor is wrong. The mistake is the Equivalent Infinitesimal Substitution after the third equal sign. 2. The Equivalent Infinitesimal Substitution has been hyped to be crazy and ridiculous in China
Simple calculation: 4:3 * 7:5 + 7:2 / 3:4 + 0.75
3/4×5/7+2/7÷4/3+0.75
=3/4×5/7+2/7×3/4+3/4
=3/4×(5/7+2/7+1)
=3/4×2
=3/2
=1.5
Factorization (2x + 3Y) ^ 2 - (2x + 3Y) (2x-3y) - 3 (2x-3y) ^ 2
（2x+3y)^2-(2x+3y)(2x-3y)-3(2x-3y)^2=(2x+3y)(2x+3y-2x+3y)-3(2x-3y)^2=(2x+3y)9y-3(2x-3y)^2=18xy+27y^2-3(4x^2-12xy+9y^2)=18xy+27y^2-12x^2+36xy-27y^2=54xy-12x^2=6x(9y-2x)
12.5 * (36-7 1 / 5) divided by 3.6
12.5 * (36-7 and 1 / 5) divided by 3.6
=12.5*36÷3.6-12.5*7.2÷3.6
=12.5*10-12.5*2
=125-25
=100
Given that the line L passes through point P (1,1) and the inclination angle is 30 ° 1), write the linear equation 2) let L and circle x2 + y2 = 4 intersect at two points a and B. find PA and Pb
(1) Parameter equation: x = 1 + T √ 3 / 2
y=1+t/2
(t is the parameter)
（2）PA*PB=（2+√2）*（2-√2）=2
Solve the equation 2X-4 = 16 1.5x-3 = 60 3.4x-4 * 3 = 52 x divided by 1 / 2 = 3 / 4
2X-4=16
2X=4+16
2X=20
X=20/2
X=10
1.5X-3=60
1.5X=3+60
1.5X=63
X=63/1.5
X=42
3.4X-4*3=52
3.4X-12=52
3.4X=52+12
3.4X=64
X=64÷3.4
X=320/17
X divided by 1 / 2 = 3 / 4
X=3/4*1/2
X=3/8
Imaginary number (X-2) + Yi, where x and y are real numbers. When the module of this imaginary number is 1, the value range of Y / X is?
Module = radical [(X-2) ^ 2 + y ^ 2] = 1, that is, (X-2) ^ 2 + y ^ 2 = 1, which means the circle with the center of (2,0) and radius of 1. Y / x = y-0 / x-0, which means the slope of the point (x, y) and the origin (0,0) on the circle. It is the maximum and minimum when it is tangent
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