X+Y=500; X(1+10%)+Y(1+20%)=570 然后解方程得:X=300 Y=200 所以:X(1+10%)=330 Y(1+20%)=240
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X+Y=500;X(1+10%)+Y(1+20%)=570然后解方程得:X=300Y=200所以:X(1+10%)=330Y(1+20%)=240X+Y=500;X(1+10%)+Y(1+20%)=5
X+Y=500; X(1+10%)+Y(1+20%)=570 然后解方程得:X=300 Y=200 所以:X(1+10%)=330 Y(1+20%)=240
X+Y=500; X(1+10%)+Y(1+20%)=570 然后解方程得:X=300 Y=200 所以:X(1+10%)=330 Y(1+20%)=240
X+Y=500; X(1+10%)+Y(1+20%)=570 然后解方程得:X=300 Y=200 所以:X(1+10%)=330 Y(1+20%)=240
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X+Y=500 ①
X(1+10%)+Y(1+20%)=570 ②
→ x+y+(10%x+20%y)=570
→x=300; y=200;10%x+20%y=70
→X(1+10%)=330 Y(1+20%)=240
(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
y'/y=1/x
y-x=1 10x+y> 10x+y30 10x+y
已知y/x=9/10则(1-y/x)[x/(y-x)]?
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
y'-(1/x)y=xe^-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
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)=10y+y-(9-8-y)=2x-y=xx-9.9xxy=11y-1 y=?x=?x+y-xy=?
化简 x / y(x+y) - y / x(x+y) =
(x+y+z)÷10=x+1.1 y+x=z-80+y-1 z-y=8x+y+8 x+z÷y=?
25(x+y)^2+10(y-x)+1=?因式分解
25(x-y)^2+10(y-x)+1=
y=ln(1+x),求y^10(x)?
解方程组x+y/6+x-y/10=3,x+y/6+y-x/10=-1x+y/6+x-y/10=3 ①x+y/6+y-x/10=-1 ②
x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、(x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
(x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.