x+(9-8-y)=10 y+y-(9-8-y)=2 x-y=xx-9.9x xy=11y-1 y=? x=? x+y-
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x+(9-8-y)=10 y+y-(9-8-y)=2 x-y=xx-9.9x xy=11y-1 y=? x=? x+y-xy=?
x+(9-8-y)=10
y+y-(9-8-y)=2
x-y=xx-9.9x
xy=11y-1
y=?
x=?
x+y-xy=?
x+(9-8-y)=10
y+y-(9-8-y)=2
x-y=xx-9.9x
xy=11y-1
y=?
x=?
x+y-xy=?
加逗号,理不清楚.
再问: ???????????????
再答: y+y-(9-8-y)=2 ∴ 3y=3 => y=1 x+(9-8-y)=10 => x=10 代入x-y=xx-9.9x xy=11y-1 检验均正确, 故y=1,x=10, x+y-xy=1
再问: ???????????????
再答: y+y-(9-8-y)=2 ∴ 3y=3 => y=1 x+(9-8-y)=10 => x=10 代入x-y=xx-9.9x xy=11y-1 检验均正确, 故y=1,x=10, x+y-xy=1
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