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This month:
Stage 1&2
Stage 2&3
Stage 3&4
Stage 4&5
Overturning Fracsum
Problem
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Solution
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Stage: 4 Challenge Level:
Solve the following system of equations to find the values of $x$, $y$ and $z$. $${xy\over (x+y)}=1/2$$ $${yz\over (y+z)} =1/3$$ $${xz\over (x+z)} = 1/7$$
alphas
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Simultaneous equations
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Manipulating algebraic expressions/formulae
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Quadratic equations
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Working systematically
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Long problems
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Inequality/inequalities
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Formulae
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Mathematical reasoning & proof
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Stage 5 - Core Mapping
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Published May 1999.
Help With Mathematical Display