7x-x+2=25.
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7x-x+2=25.7x-x+2=25.7x-x+2=25.7x-x+2=25.47x-x=25.4-26x=23.4x=23.4÷6x=3.97x-x+2=25.46x=25.4-26x=23.4x
7x-x+2=25.
7x-x+2=25.
7x-x+2=25.
7x-x+2=25.4
7x-x=25.4-2
6x=23.4
x=23.4÷6
x=3.9
7x-x+2=25.4
6x=25.4-2
6x=23.4
x=3.9
7x-x+2=25.4
6x+2=25.4
6x=25.4-2
6x=23.4
x=3.9
7x-x=25.4-2
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
x/x-2+x-9/x-7=x+1/x-1+x-8/x-6,
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
2x+3x+4x+5x+x+6x+7x=100
7x-x+2=25.
x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?
(x+1)/(x+2)+(x+8)/(x+9)解答x+1/x+2+x+8/x+9=x+2/x+3+x+7/x+8
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填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x
7x^2-5x=2x^2+x
x-2/3x+x+2/7x=30
27046=2x( )+7x( )+4x( )+6x( )
47026=4x()+7x()+2x()+6x()
2706=2x( )+7x( )+4x( )+6x( )
(x+7)(x+6)-(x-2)(x+1)=?
(x-2)(x+1)(x+4)(x+7)=19
X-5+8*X=7*X-2*X-1