作业帮化简(x^2-4\x^2-4x+4+2-x\x+2).其中x=-3
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/08 02:33:27
化简(x^2-4\x^2-4x+4+2-x\x+2).其中x=-3
化简(x^2-4\x^2-4x+4+2-x\x+2).其中x=-3
化简(x^2-4\x^2-4x+4+2-x\x+2).其中x=-3
原式=(x+2)(x-2)/(x-2)^2-(x-2)/(x+2)
=(x+2)/(x-2)-(x-2)/(x+2)
=[(x+2)^2-(x-2)^2]/(x+2)(x-2)
=(x+2+x-2)(x+2-x+2)/(x+2)(x-2)
=4x/(x+2)(x-2)
=-12/[(-1)×(-5)]
=-12/5
(x²-4)/(x²-4x+4)+(2-x)/(x+2)
(x²-2²)/(x²-2×2x+2²)+(2-x)/(x+2)
=(x+2)(x-2)/(x-2)²-(x-2)/(x+2)
=(x+2)/(x-2)- (x-2)/(x+2)
=[(x+2)(x+2)-(x-2)(x-2)]/[(x-2...
全部展开
(x²-4)/(x²-4x+4)+(2-x)/(x+2)
(x²-2²)/(x²-2×2x+2²)+(2-x)/(x+2)
=(x+2)(x-2)/(x-2)²-(x-2)/(x+2)
=(x+2)/(x-2)- (x-2)/(x+2)
=[(x+2)(x+2)-(x-2)(x-2)]/[(x-2)(x+2)]
=[(x+2)²-(x-2)²]/[(x-2)(x+2)]
=[(x+2+x-2)(x+2-x+2)]/(x²-4)
=4(2x)/(x²-4)
=8x/(x²-4)
=8×(-3)/((-3)²-4)
=-24/(9-4)
=-24/5
收起
*-----------------------------------------------*| 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 ||
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