x-y=98 xy=200 x/y=50 x=?y=?liu xia shu xue ji suan

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x-y=98xy=200x/y=50x=?y=?liuxiashuxuejisuanx-y=98xy=200x/y=50x=?y=?liuxiashuxuejisuanx-y=98xy=200x/y=

x-y=98 xy=200 x/y=50 x=?y=?liu xia shu xue ji suan
x-y=98 xy=200 x/y=50 x=?y=?
liu xia shu xue ji suan

x-y=98 xy=200 x/y=50 x=?y=?liu xia shu xue ji suan
因为x/y=50 所以x=50y 且xy同号因为xy=200 所以50yy=200 所以yy=4 y=2或-2
x-y=98 所以当y=2时x=100或当y=-2时x=96
因为xy同号所以x=100 y=2

x-y=98 xy=200 x/y=50 x=? y=?
xy*x/y=x^2=10000 因为x y同号所以均为正
所以x=100 代入x-y=98得y=2

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