y-x=1 10x+y> 10x+y30 10x+y

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y-x=110x+y>10x+y3010x+yy-x=110x+y>10x+y3010x+yy-x=110x+y>10x+y3010x+yy-x=1,y=x+1代入10x+(x+1)>30,10x+x

y-x=1 10x+y> 10x+y30 10x+y
y-x=1 10x+y> 10x+y30 10x+y

y-x=1 10x+y> 10x+y30 10x+y
y-x=1,y=x+1
代入
10x+(x+1)>30,10x+x+1>30,11x>29,x>29/11
y=x+1>(29/11)+1>40/11
10x+(x+1)

① 先把y-x=1变形成y=1+x
② 把y=1+x带入10x+y＞30,10x+y＜42
得10x+1+x＞30
x＞29/11
10x+1+x＜42
x＜41/11
∴29/11＜x＜41/11
③ 再把y-x=1变形成x=y-1
④ 把...

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① 先把y-x=1变形成y=1+x
② 把y=1+x带入10x+y＞30,10x+y＜42
得10x+1+x＞30
x＞29/11
10x+1+x＜42
x＜41/11
∴29/11＜x＜41/11
③ 再把y-x=1变形成x=y-1
④ 把x=y-1带入10x+y＞30,10x+y＜42
得10（y-1）+y＞30
y＞40/11
10（y-1）+y＜42
y＜52/11
∴40/11＜y＜52/11

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y-x=1 10x+y> 10x+y30 10x+y -3%=x+（5%-x)y30%=x+(20%-x)y (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 {6/x+y+10/x-y=30 6/x+y-10/x-y=-1 已知y/x=9/10则(1-y/x)[x/(y-x)]? {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 y+10x=x+y+9 10y+x=y+10x+27 25(x-y)*2+10(y-x)+125（x-y)^2+10(y-x)+1 y+y+x=10,x+y+x=8,y=?,x=? 已知|x|+x+y=10 |y|+x-y=12 求 x+y=? 已知|x|+x+y=10,|y|+x-y=12,求x+y的值已知|x|+x+y=10,x+|y|-y=12,求x、y的值已知/x/+x+y=10,/y/+x-y=12.求x+y的值 (x+y)(x+y-10)+25=0,且x-y=3,求x,y (x+y)(x+y-10)+25=0,且x-y=3,求x,y X+Y-8X+10Y+41=O,求X/Y-Y/X的值 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 25（x+y)^2+10(y-x)+1=?因式分解