(x-2y)2+(x+2y)(x-2y)-(x-3y)(x-y)计算结果是什么?x等于-4,y等于0.5代入后是多少第一个括号后的2是平方意
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 12:39:23
![(x-2y)2+(x+2y)(x-2y)-(x-3y)(x-y)计算结果是什么?x等于-4,y等于0.5代入后是多少第一个括号后的2是平方意](/uploads/image/z/359007-15-7.jpg?t=%28x-2y%292%2B%28x%2B2y%29%28x-2y%29-%28x-3y%29%28x-y%29%E8%AE%A1%E7%AE%97%E7%BB%93%E6%9E%9C%E6%98%AF%E4%BB%80%E4%B9%88%3Fx%E7%AD%89%E4%BA%8E-4%2Cy%E7%AD%89%E4%BA%8E0.5%E4%BB%A3%E5%85%A5%E5%90%8E%E6%98%AF%E5%A4%9A%E5%B0%91%E7%AC%AC%E4%B8%80%E4%B8%AA%E6%8B%AC%E5%8F%B7%E5%90%8E%E7%9A%842%E6%98%AF%E5%B9%B3%E6%96%B9%E6%84%8F)
(x-2y)2+(x+2y)(x-2y)-(x-3y)(x-y)计算结果是什么?x等于-4,y等于0.5代入后是多少第一个括号后的2是平方意
(x-2y)2+(x+2y)(x-2y)-(x-3y)(x-y)计算结果是什么?x等于-4,y等于0.5代入后是多少第一个括号后的2是平方意
(x-2y)2+(x+2y)(x-2y)-(x-3y)(x-y)计算结果是什么?x等于-4,y等于0.5代入后是多少第一个括号后的2是平方意
(x-2y)²+(x+2y)(x-2y)-(x-3y)(x-y)
=x²-4xy+4y²+x²-4y²-x²+4xy-3y²
=x²-3y²
x=-4,y=0.5
代入原式=(-4)²-3(0.5)²=16-0.75=15.25
x^2-3y^2
(x-2y)^2+(x+2y)(x-2y)-(x-3y)(x-y)
=x^2-4xy+4y^2+x^2-4y^2-(x^2-xy-3xy+3y^2)
=x^2-4xy+4y^2+x^2-4y^2-x^2+xy+3xy-3y^2
=x^2-3y^2
当x=-4,y=0.5时,
原式=16-0.75=15.25
x^2-3y^2
15.25
x^2+4y^2-4xy+x^2-2xy+2xy-4y^2-x^2+3xy+xy-3y^2=x^2-3y^2
15.25
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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)
因式分解x(x+y)(x-y)-x(x+y)^2
[(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
[(x-y)²+(x+y)(x-y)]除以2x
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简:{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
化简:[(x+y)(x-y)(x+y)^2-2y(x-2y)](-2y) 谢谢!
计算:[(x+y)(x-y)-(x-y)^2+2y(x-y)]/(-2y)
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x