化简(x^2-y^2)/(x+y)解法一：(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二：(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因

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化简(x^2-y^2)/(x+y)解法一：(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二：(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因

化简(x^2-y^2)/(x+y)解法一：(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二：(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因
化简(x^2-y^2)/(x+y)
解法一：(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y
解法二：(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y
你认为小红同学的两种解法对吗?若解法错误,请说明原因

化简(x^2-y^2)/(x+y)解法一：(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二：(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因
解法1 没问题
解法2 只有在x-y不等于0时可行

化简(x^2-y^2)/(x+y)解法一：(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二：(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因 (x-2y)^2+(x+2y)(x-2y)+(x+2y)^2 多种解法 （x+3y)^2-(x-3y)^2双解法 不等式的线性规划问题解法?x+2y=z x+y>10 x-y 谁能帮我解决高数中的一个问题y^x=x^y 求y对x的导数解法一：xlny=ylnxlny+x*y'/y=y'lnx+y/xy'=(y^2-xylny)/(x^2-xylnx)解法二：F(x,y)=y^x-x^yy'=-Fx'/Fy'y'=(y^xlny-y*x^(y-1))/(x*y^(x-1)-x^ylnx)两者答案不一样,小弟不知错 y=(x-3)(2-x)^2解法 x+x+x-y-y=12 y+y+y-x-x=2 求x=?y=?奥数解法 x+x+x-y-y=12 y+y+y-x-x=2 求x=?y=?不能用方程用奥数解法 化简y(x+y)+(x+y)(x-y)-x^2 因式分解 分组分解法（x+2）（x-2）-4y（x-y） 微分方程解法dy/dx-x/(2y)=1/2 2个未知数的解法?比如x和y 抛物线y^2=16x的焦点解法 方程x:y=2:3 2x+3y=130的解法 求解法,我不懂! (x-2y)(x+2y)一(3x+y)(3x一y) 求一函数值域问题的解法求：函数y=2x/[(x^2)+1]的值域～ 二元一次方程加减的解法2X+3Y=63X-2Y=-2 x^2+2x-8+6y-y^2分组分解法.