{X+0.2Y-4.94=15{0.02Y=10×0.4%X
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{X+0.2Y-4.94=15{0.02Y=10×0.4%X
{X+0.2Y-4.94=15
{0.02Y=10×0.4%X
{X+0.2Y-4.94=15{0.02Y=10×0.4%X
大哥,你这是一题的么
X+0.2Y-4.94=15 ①
0.02Y=10×0.4%X ②
①-②*10得:1.4x=19.94
解得:x=997/70
{X+0.2Y-4.94=15{0.02Y=10×0.4%X
x=15y
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
x^2+y^2=15,x+y=7,x>y,求x-y
x+x+x=15,x+y+y=19,求y-x等于几
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
已知x+y+y=20,x+y=15求x.y
化简 x / y(x+y) - y / x(x+y) =
(12-x)*y+x*2=26 (15-x)*y+y*2=35(12-x)*y+x*2=26 (15-x)*y+y*2=35
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+y=15 0.2x+0.5y=4.5 怎么解
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{2x+y=15 x+2y=18
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x-3y=2x+y-15=1
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