[(3/5)X+400]/(X+400)=2/3
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[(3/5)X+400]/(X+400)=2/3[(3/5)X+400]/(X+400)=2/3[(3/5)X+400]/(X+400)=2/3(3x+2000)/(5x+2000)=2/39x+60
[(3/5)X+400]/(X+400)=2/3
[(3/5)X+400]/(X+400)=2/3
[(3/5)X+400]/(X+400)=2/3
(3x+2000)/(5x+2000)=2/3
9x+6000=10x+4000
x=2000
7x+5x+3(400-2x)=1920
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请求数学题[(x*5%)+(x*3%+2)+(x*0.2%)]=400求X
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
|x-5|+|x-3|
3x-|x+5|
(x+3)(x-5)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
(x+3x+5x...+2009x)-(2x+4x+6x+...+2010x)
x/x-3-5x/x^2-x-6计算
x^5-x^4+x^3-x^2+x-1
求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X
计算:x/x-2 - 5x/x²-x-6计算:x/x-3 - 5x/x²-x-6
[(3/5)X+400]/(X+400)=2/3
5×5/3X-5X=400解方程
解400÷(5X-3X)=20方程
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