已知y=2√2x-1+3√1-2x+1/3,求(2x+y)(x-y)的值?
问题描述:
已知y=2√2x-1+3√1-2x+1/3,求(2x+y)(x-y)的值?
答
已知y=2√2x-1+3√1-2x+1/3,
∴2x-1≥0;
x≥1/2;
1-2x≥0;
x≤1/2;
∴x=1/2;y=1/3;
求(2x+y)(x-y)的值?
=(2×1/2+1/3)(1/2-1/3)
=(4/3)×(1/6)
=2/9;
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