⑴(1/x+1)+(1/x^2-1)-(1/x-1)⑵(1/x+1)-﹙x+2/x^2-1﹚×﹙x^2-2x+1/x^2+4x+4﹚
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⑴(1/x+1)+(1/x^2-1)-(1/x-1)⑵(1/x+1)-﹙x+2/x^2-1﹚×﹙x^2-2x+1/x^2+4x+4﹚
⑴(1/x+1)+(1/x^2-1)-(1/x-1)⑵(1/x+1)-﹙x+2/x^2-1﹚×﹙x^2-2x+1/x^2+4x+4﹚
⑴(1/x+1)+(1/x^2-1)-(1/x-1)⑵(1/x+1)-﹙x+2/x^2-1﹚×﹙x^2-2x+1/x^2+4x+4﹚
①原式
=(x-1/x²-1)+(1/x²-1)-(x+1/x²-1)
=(x-1+1-x-1)/(x²-1)
=-1/x²-1
②原式
=(1/x+1)-(x+2)/(x+1)(x-1) × (x-1)²/(x+2)²
=(1/x+1)-(x-1)/(x+1)(x+2)
=(x+2)/(x+1)(x+2) - (x-1)/(x+1)(x+2)
=(x+2-x+1)/(x²+3x+2)
=3/(x²+3x+2)
解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1
请问这道题咋做 :(x)X (x+1) X (x+2) X (x+3) =360
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