Factorization: A ^ 4 + B ^ 4-2a ^ 2B ^ 2-2b ^ 2C ^ 2-2c ^ 2A ^ 2

Factorization: A ^ 4 + B ^ 4-2a ^ 2B ^ 2-2b ^ 2C ^ 2-2c ^ 2A ^ 2

The original formula of + C ^ 4, which is the original formula of + C ^ 4-4-4a-and-35;178; (a ^ 4-2a-2a-#178; B \35;###\35;\35;\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\; C & # 178; = (A & # 178; - B & # 178; + C & # 178;) - # 178; - 4A & # 178

a^4+b^4-2a^2b^2-2b^2c^2-2c^2a^2

Adding a C ^ 4 and subtracting a C ^ 4 should be solvable

Factorization a ^ 2-2a + 1-B ^ 2

a^2-2a+1-b^2
=（a-1)²-b²
=(a-1+b)(a-1-b)

The diameter of a round flower bed is 8 meters. Now we need to build a 1 meter wide path around the flower bed to find the area of the path

The path is a circle
Flower bed radius = 8 △ 2 = 4 (m)
Outer circle radius = 4 + 1 = 5 (m)
Road area = 3.14 × (5 & # 178; - 4 & # 178;) = 28.26 (M2)

That, fanily plural, here antonym, carefuly adjective, teachers possessive,

That plural
Family plural families
The antonym here is there
Carefuly adjective carefuly
Teachers' possessive

Sine theorem cosine theorem
1. In △ ABC, AC = 6, BC = 4, C = 120
2. In △ ABC, if B & sup2; = AC and C = 2A are known, then CoSb is obtained

1. First cosine theorem
AB^2=AC^2+BC^2-2*AC*BC*CosC=36+16-2*6*4*(-0.5)=76
AB=2√19
Re sine theorem
sinA/BC=sinC/AB
sinA=4*√3/2/2√19=√57/19
2.CosB=(a^2+c^2-b^2)/2ac=(a^2+4a^2-2a^2)/4a^2=3/4

The construction of the present continuous tense and the usage of the general present tense

We are waiting for you. We are waiting for you

Maybe it's because I don't understand. I think it's hard to understand the solubility. 1 Why do I need to cool down, evaporate solvent and add solute when unsaturated solution becomes saturated? (can you give me a specific example) but I understand when saturated solution becomes unsaturated 2. According to the solubility curve, how to judge whether the solution is saturated or unsaturated at this temperature? 3. According to the mixture of a and B, how to judge whether to use cooling crystallization or evaporation crystallization? 4. When the temperature rises from low to high, how to judge the solute mass fraction relationship of several saturated solutions? 5. When the temperature drops from high to low, how to judge whether there will be crystal precipitation according to the solubility curve?

1. If you need a cup of saturated salt water, what should you do? If you just sprinkle a little salt, it is obviously not enough. If you add more salt, it will be saturated. If you only have a cup of semi saturated salt water, what should you do? If you have more water, it will be OK to evaporate some water, so it will evaporate the solvent

How to measure the capacitance of capacitor by ammeter and voltmeter

It should be noted that the voltmeter can not use the ordinary voltmeter, but need to use the electrometer. C = q / u, we can know that the capacitance of the capacitor can be calculated by measuring the charge quantity Q of the capacitor and the voltage u at both ends of the capacitor. Measure the voltage u at both ends of the capacitor with the electrometer, and record the I-T image of the capacitor discharge with the computer, The area enclosed by the image and coordinate axis is the charged quantity Q of the capacitor. The capacitance can be measured by C = q / u

Which principle of Marxism is used in the Sinicization of Marxism in the reform and opening up?

Matter decides consciousness, and consciousness reacts on matter. Everything starts from reality
Practice decides cognition. Practice is the only criterion to test the truth of cognition. Practice is the source and the purpose of cognition
Under the guidance of Marx's universal principle, we should use the dialectical relationship between universality and particularity of contradiction, and combine with China's national conditions to make concrete analysis of specific problems
Truth is infinite, and it is developing and conditional