x+y)^2-14(x+y)+49
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x+y)^2-14(x+y)+49x+y)^2-14(x+y)+49x+y)^2-14(x+y)+49(x+y)^2-14(x+y)+49=(x+y-7)^2这其实是一个完全平方差公式,将(x+y)看
x+y)^2-14(x+y)+49
x+y)^2-14(x+y)+49
x+y)^2-14(x+y)+49
(x+y)^2-14(x+y)+49=(x+y-7)^2
这其实是一个完全平方差公式,将(x+y)看成一个整未知数a,则原式变为a^2-14a+49=a^2+2*7a+7^2=(a-7)^2即等于(x+y-7)^2
（x+y-7）^2
等于(x+y-7)^2
(x+y)^2-14(x+y)+49
= (x+y)^2-14(x+y)+7^2
= (x+y-7)^2
x+y)^2-14(x+y)+49
(x+y)²-14(x+y)+49
(x-y)平方-14(x+y)+49
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(x-y)^2+5(x-y)-14
(x-y)^2-14(y-x)+49的解
分解因式（x+y)^2-14(x+y）+49
化简y(x+y)+(x+y)(x-y)-x^2
(x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
(x+y)平方-14(x+y)+49y的平方
因式分解x(x+y)(x-y)-x(x+y)^2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
[(x-y)^2-(x+2y)(x-2y)]/y
计算:y-x分之x+y+x-y分之y-y-x分之2x-y
x^2(x-y)+(y-x)
x(x-y)2-(y-x)3
【(x-y)^2+(x+y)(x-y)】除以 2x