化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=?
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化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=?
化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=?
化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=?
化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9),并求当x=2,y=9时的值
(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
=(1+2+3+……+9)x+y(1+1-1/2+1/2-1/3+……+1/8-1/9)
=45x+y(2-1/9)
=45x+17/9y
=45×2+17/9×9
=90+17
=107
化简(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9),并求当x=2,y=9时的值
(x+y)+(2x+y/1*2)+(3x+y/2*3)+...+(9x+y/8*9)
=(1+2+3+……+9)x+y(1+1-1/2+1/2-1/3+……+1/8-1/9)
=45x+y(2-1/9)
=45x+17/9y
=45×2+17/9×9
=90+17
=107
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