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Optimal design of mathematics problems in grade three 4
Y is inversely proportional to x, let Y=K/X(K is constant, K≠0),

Z is proportional to y, let Z=K 1Y, (K 1 is a constant, K 1≠0),

∴Z=KK 1/X，

∞KK 1 is a constant, KK 1≠0,

∴Z is inversely proportional to x

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