若√17的整数部分是x,小数部分是y,则√下x的平方+1 剪1/y的值
2个回答
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原式=3X²-2X²+XY-2Y²+Y²+XY-X²
=2XY-Y²
=2×0.1×(-0.5)²-(-0.5)²
=-0.2 原式=3X²-2X²+XY-2Y²+Y²+XY-X²
=2XY-Y²
=2×0.1×(-0.5)²-(-0.5)²
=-0.2 原式=3X²-2X²+XY-2Y²+Y²+XY-X²
=2XY-Y²
=2×0.1×(-0.5)²-(-0.5)²
=-0.2
=2XY-Y²
=2×0.1×(-0.5)²-(-0.5)²
=-0.2 原式=3X²-2X²+XY-2Y²+Y²+XY-X²
=2XY-Y²
=2×0.1×(-0.5)²-(-0.5)²
=-0.2 原式=3X²-2X²+XY-2Y²+Y²+XY-X²
=2XY-Y²
=2×0.1×(-0.5)²-(-0.5)²
=-0.2
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