①:6x+8y=55.②:3x+8y=30.
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①:6x+8y=55.②:3x+8y=30.①:6x+8y=55.②:3x+8y=30.①:6x+8y=55.②:3x+8y=30.①-②得:3x=55.8-30.3;x=8.5x=8.5代入②得:8
①:6x+8y=55.②:3x+8y=30.
①:6x+8y=55.②:3x+8y=30.
①:6x+8y=55.②:3x+8y=30.
①-②得:3x=55.8-30.3; x=8.5
x=8.5代入②得:8.5×3+8y=30.3,y=0.6
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x+y=5① x=3y+2① 9x-5y=1① 3x-2y=11① x-2y=y+1① 2x-y=7② x+3y=8② 6x-7y=2② 2x+3y=16② 2x-3y=10②3x+2y=y+1①2x-3y=10②D
①:6x+8y=55.②:3x+8y=30.
(x+y)/y=8/3则x/y=__ y/x-y=___
(x+y)/y=8/3则x/y=__ y/x-y=___
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填空题 x+y/4=x-y/6=3x+12y+5/8 x= y=