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- Optimal design of P50 in eighth grade math problem: 2
Optimal design of P50 in eighth grade math problem: 2
This question examines the sign change of inequality when both sides of inequality are multiplied by negative numbers at the same time.
From the topic Y=0=3K+B, K=-B/3.
KX+B& gt； 0，KX & gt； -B.
Because k
——KX & lt； b，X & ltB/-K=3
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