x-1/3x-1/2x=20
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x-1/3x-1/2x=20x-1/3x-1/2x=20x-1/3x-1/2x=20
x-1/3x-1/2x=20
x-1/3x-1/2x=20
x-1/3x-1/2x=20
(X+1)X(X+2)X(X+3)=504
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
解方程X(X+1)-X(X-3)=2(X+1)(X-1)+20
x(x+1)²-x(x²-3)-2(x+1)(x-1)=20
2x(x-1)-x(3x+2)=(-x-1)(x+6)-20
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x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x
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