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Secondary

School:

Refraction and lenses

Chemistry - Periodic table

Maths

My calculator 二元一次方程
How to find the median value
Algebra calculator - 2x2 and 3x3 equations
離散數據 vs 連續數據
離散數據即係數據之間係斷開既 ~ 有一定既拒離
例如人數,可以1個,2個,10個,但唔會有0.3個咁樣 ~ not continuous
離散數據仲可以唔係數字呢,
例如: 血型, 國籍等等
連續數據就係之間唔會斷開既 ~ 可以填滿空隙
例如重量,高度,170cm同171cm中間可以有170.5,170.13,etc
continuous

Matrix A: 2 -1 -1 
1 3 4 
5 -2 3' 
Matrix B: x 
y 
z 
Matrix C: 17 
-20 
19 
Enter each matrix into your calculator and then take the inverse of Matrix A. Then multiply the inverse of Matrix A by Matrix C. This then is your answer. The first row represents the answer for x, the second row is your y, and the third row is your answer for z. Hope I helped, this is the easiest way to solve 3 variable equations.

Finding inverse of a 3x3 matrix video
Inverse matrix calculator
Multiplying matrix