book
Maths Puzzle
Numerical Ability
Use Cramers Rule to solve.
2x+2y+z=1
-x+y+2z=3
x+2y+4z=0
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book Other Question
(x^2+8x+12/x-5)/(3x+18/x^2-25)
Evaluate x to 5 significant digits
x = ln (4.3931 x 10^-11)