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先化简在求值.1/2X*1/X+Y[X²-Y²+X+Y/2X]其中X=1Y=2负三平方
题目详情
先化简在求值.1/2X*1/X+Y[X²-Y²+X+Y/2X]其中X=1 Y=2负三平方
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答案和解析
1/2X*1/X+Y[X²-Y²+X+Y/2X]
=1/2X* 1/(X+Y) *(X-Y)(X+Y)+1/2X* 1/X+Y * (X+Y)/2X
=(X-Y)/2X + 1/4X^2
=(1-2^(-3))/2*1 + 1/4*1^2
=(1-1/8)/2 + 1/4
=7/16+4/16
=11/16
=1/2X* 1/(X+Y) *(X-Y)(X+Y)+1/2X* 1/X+Y * (X+Y)/2X
=(X-Y)/2X + 1/4X^2
=(1-2^(-3))/2*1 + 1/4*1^2
=(1-1/8)/2 + 1/4
=7/16+4/16
=11/16
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