求几道初一数学因式分解题目解答1.4x^2-y^2-2y-142.(x^2-xy)/(xy-y^2)-(y^2+xy)/(x^2+xy)+(x^2+y^2)/xy3.(x-2)/x^2/(1-2/x)4.(x-1)/(x^2+3x+2)-6/(x^2-x-2)-(x-10)/(x^2-4)5.100^2-99^2+98^2-97^2+...+2^2-1^2
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![求几道初一数学因式分解题目解答1.4x^2-y^2-2y-142.(x^2-xy)/(xy-y^2)-(y^2+xy)/(x^2+xy)+(x^2+y^2)/xy3.(x-2)/x^2/(1-2/x)4.(x-1)/(x^2+3x+2)-6/(x^2-x-2)-(x-10)/(x^2-4)5.100^2-99^2+98^2-97^2+...+2^2-1^2](/uploads/image/z/31263-15-3.jpg?t=%E6%B1%82%E5%87%A0%E9%81%93%E5%88%9D%E4%B8%80%E6%95%B0%E5%AD%A6%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E9%A2%98%E7%9B%AE%E8%A7%A3%E7%AD%941.4x%5E2-y%5E2-2y-142.%28x%5E2-xy%29%2F%28xy-y%5E2%29-%28y%5E2%2Bxy%29%2F%28x%5E2%2Bxy%29%2B%28x%5E2%2By%5E2%29%2Fxy3.%28x-2%29%2Fx%5E2%2F%281-2%2Fx%294.%28x-1%29%2F%28x%5E2%2B3x%2B2%29-6%2F%28x%5E2-x-2%29-%28x-10%29%2F%28x%5E2-4%295.100%5E2-99%5E2%2B98%5E2-97%5E2%2B...%2B2%5E2-1%5E2)
求几道初一数学因式分解题目解答1.4x^2-y^2-2y-142.(x^2-xy)/(xy-y^2)-(y^2+xy)/(x^2+xy)+(x^2+y^2)/xy3.(x-2)/x^2/(1-2/x)4.(x-1)/(x^2+3x+2)-6/(x^2-x-2)-(x-10)/(x^2-4)5.100^2-99^2+98^2-97^2+...+2^2-1^2
求几道初一数学因式分解题目解答
1.4x^2-y^2-2y-14
2.(x^2-xy)/(xy-y^2)-(y^2+xy)/(x^2+xy)+(x^2+y^2)/xy
3.(x-2)/x^2/(1-2/x)
4.(x-1)/(x^2+3x+2)-6/(x^2-x-2)-(x-10)/(x^2-4)
5.100^2-99^2+98^2-97^2+...+2^2-1^2
求几道初一数学因式分解题目解答1.4x^2-y^2-2y-142.(x^2-xy)/(xy-y^2)-(y^2+xy)/(x^2+xy)+(x^2+y^2)/xy3.(x-2)/x^2/(1-2/x)4.(x-1)/(x^2+3x+2)-6/(x^2-x-2)-(x-10)/(x^2-4)5.100^2-99^2+98^2-97^2+...+2^2-1^2
5.100+99+98+97+...+1=5050
4.0
3 看不懂啊,不好意思啊
2 (2X^2+2Y^2)/XY
1 (X-2)(X+2)+3(X+更号3)(X-更号3)-(Y+I)^2
有点累啊
^是什么?
我只会第五题.
用公式x^2-y^2=(x+y)(x-y) 比如100^2-99^2=(100+99)(100-99)=100+99
所以原式=100+99+98+97+..........+2+1=100(100+1)/2=5050