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二元一次100Y+10(X+Y-1)+X=9(X+X+Y-1+Y)×3,100X+10(X+Y-1)+Y=100Y+10(X+Y-1)+X+99；
题目详情
二元一次
100Y+10(X+Y-1)+X=9(X+X+Y-1+Y)×3,
100X+10(X+Y-1)+Y= 100Y+10(X+Y-1)+X+99；
100Y+10(X+Y-1)+X=9(X+X+Y-1+Y)×3,
100X+10(X+Y-1)+Y= 100Y+10(X+Y-1)+X+99；
▼优质解答
答案和解析
100Y+10(X+Y-1)+X=9(X+X+Y-1+Y)×3,
11X+110Y-10=54X+54Y-27
43X-56Y=17 (1)
100X+10(X+Y-1)+Y= 100Y+10(X+Y-1)+X+99
110X+11Y-10=110Y+11X+89
99X-99Y=99
Y=X-1 (2)
所以43X-56(X-1)=17
-13X=17-56=-39
X=3
Y=X-1=2
11X+110Y-10=54X+54Y-27
43X-56Y=17 (1)
100X+10(X+Y-1)+Y= 100Y+10(X+Y-1)+X+99
110X+11Y-10=110Y+11X+89
99X-99Y=99
Y=X-1 (2)
所以43X-56(X-1)=17
-13X=17-56=-39
X=3
Y=X-1=2
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