若|y+5|+(5x+1)^2=0, 求-3(2x-y)-{7x-[6x+2y-(10x-8y)]-x-2(3x-4y)}的值
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2013-10-27
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|y+5|+(5x+1)^2=0
|y+5|=0,(5x+1)^2=0
y=-5,x=-1/5
-3(2x-y)-{7x-[6x+2y-(10x-8y)]-x-2(3x-4y)}
=-3(2x-y)-{7x-[6x+2y-10x+8y]-x-2(3x-4y)}
=-6x+3y-7x+[10y-4x]+x+2(3x-4y)
=-10x+5y
=-10*(-1/5)+5*(-5)
=-23
|y+5|=0,(5x+1)^2=0
y=-5,x=-1/5
-3(2x-y)-{7x-[6x+2y-(10x-8y)]-x-2(3x-4y)}
=-3(2x-y)-{7x-[6x+2y-10x+8y]-x-2(3x-4y)}
=-6x+3y-7x+[10y-4x]+x+2(3x-4y)
=-10x+5y
=-10*(-1/5)+5*(-5)
=-23
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