Summary of physics formula in grade eight

Summary of physics formula in grade eight

1. Average velocity v = s / T
2. Density ρ = m / V (V refers to volume)
3. Pressure P = f / S
4. Pressure of liquid p (liquid) = ρ GH
5. The pressure of atmosphere P (atmosphere) ≈ 1.013 × 10 & # 179; kg / M & # 179;
6. Buoyancy f (floating) = g (row) = ρ (liquid) GV (row)

All the formulas, definitions and relations of physics in Grade 8 of PEP
Let's list out these formulas, definitions and relations. Thank you,

Thank you for thinking of this Can buy this (super junior high school mathematics and chemistry formula theorem Encyclopedia) more than 30 yuan a. very good color reference book

Given AB = - 1, a + B = 2, find a & # 178; 1 / 2 + B & # 178; 1 / 2

1/a²+1/b²
=（1/a+1/b）²-2*1/a*1/b
=[（a+b）/ab]²-2/ab
=4-2/（-1）
=6

What is one minus three eighths?

3 out of 1-8 = 5 out of 8, big brother, please give me praise!

[1 - (1 / 2-1 / 3] / / 5 / 7, 13 △ 39 + (1 / 26 + 2 / 39) × 13, 13 / 18 × 5.16 + 516% × 5 / 18, 3 / 5] / [(3 / 8 + 1 / 2) × 7 / 9] (those that can be calculated simply should be calculated simply)

[1 - (1 / 2-1 / 3] / / 5 / 7 = (1-1 / 6) / / 5 / 7 = 5 / 6 ／ 5 / 7 = 6 / 713 ／ 39 + (1 / 26 + 2 / 39) × 13 = 1 / 3 + 1 / 26x13 + 2 / 39x13 = 1 / 3 + 1 / 2 + 2 / 3 = 1 + 1 / 2 = 3 / 218 of 13 × 5.16 + 516% × 18 of 5 = 5.16x13 / 18 + 5.16x5 / 18 = 5.16x (1 / 38 + 5 / 18) = 5.16x

How to calculate 123 * 18-123 * 3 + 85 * 123? It's very urgent!

123*（18-3+5）=123*20

Given a + B = 5, ab = bisection 13, find 1. A & # 178; - AB + B & # 178; 2. {A-B} & # 178; + 5
emergency

∵ a+b=5；
     ab=13/2；
∴（1）a²-ab+b²=（a²+2ab+b²）-3ab=（a+b）²-3ab
                           =5²-3×13/2=25-39/2=11/2；
 
2）、（a-b）²+5
=a²-2ab+b²=5
=（a²+2ab+b²）-4ab+5
=（a+b）²-4ab+5
=5²-4×13/2+5
=30-26
=4

Simple algorithm of Mathematics: 0.125 * 4 / 3 + 1 / 8 * 8.25 + 12.5 2 and 1 / 2 * 6.6 + 2.5 * 6 and 3 / 5 (111 + 999) / [56 * (3 / 7-3 / 8)]

Is this one question or three questions!

Factorization of X to the fourth power plus 2x plus 1

x^4+2x+1
=x^4-x²+x²+2x+1
=x²(x-1)(x+1)+(x+1)²
=(x+1)(x³-x²+x+1)

How to calculate 4.7 times 10 minus 4.7 simply

Calculate with a calculator