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数学
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(x+y)+(2x+1/1*2y)+(3x+1/2*3y)+.+(9x+1/8*9y) x=2 y=90求和
人气:308 ℃ 时间:2019-11-02 05:01:31
解答
(1+2+3+...+9)x+(1+(1-1/2)+(1/2-1/3)+...+(1/7-1/8)+(1/8-1/9))y
=50x+(1+1-1/9)y
=100+270
=370
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(x+y)+(2x+1/1*2y)+(3x+1/2*3y)+.+(9x+1/8*9y) 当X=2,Y=9时,求代数式的值
化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=?
化简:(x+y)+(2x+1/1×2y)+(3x+1/2×3y)+…+(9x+1/8×9y),并求当x=2,y=9时式子的值.
若2x+3y=2013,则代数式2(3x-2y)-(x-y)+(-x+9y)= ?
若2x+3y=2010,则代数式2(3x-2y)-(x-y)+(-x+9y)=( )
若10a=5,10b=6,则102a+3b=_.
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