初一数学...6.4因式分解的简单应用..解方程..X^2-4X-12=0X+2X^2-15=024X-3X^2=0已知(X+Y)^2-2X-2Y+1=0,求2X^2+4XY+2Y^2的值已知a,b,c为三角形三边,试判断a^2ab+b^2-c^2大于0还是小于0还是等于0要有过程撒~~
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![初一数学...6.4因式分解的简单应用..解方程..X^2-4X-12=0X+2X^2-15=024X-3X^2=0已知(X+Y)^2-2X-2Y+1=0,求2X^2+4XY+2Y^2的值已知a,b,c为三角形三边,试判断a^2ab+b^2-c^2大于0还是小于0还是等于0要有过程撒~~](/uploads/image/z/6862372-52-2.jpg?t=%E5%88%9D%E4%B8%80%E6%95%B0%E5%AD%A6...6.4%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E7%9A%84%E7%AE%80%E5%8D%95%E5%BA%94%E7%94%A8..%E8%A7%A3%E6%96%B9%E7%A8%8B..X%5E2-4X-12%3D0X%2B2X%5E2-15%3D024X-3X%5E2%3D0%E5%B7%B2%E7%9F%A5%EF%BC%88X%2BY%EF%BC%89%5E2-2X-2Y%2B1%3D0%2C%E6%B1%822X%5E2%2B4XY%2B2Y%5E2%E7%9A%84%E5%80%BC%E5%B7%B2%E7%9F%A5a%2Cb%2Cc%E4%B8%BA%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%89%E8%BE%B9%2C%E8%AF%95%E5%88%A4%E6%96%ADa%5E2ab%2Bb%5E2-c%5E2%E5%A4%A7%E4%BA%8E0%E8%BF%98%E6%98%AF%E5%B0%8F%E4%BA%8E0%E8%BF%98%E6%98%AF%E7%AD%89%E4%BA%8E0%E8%A6%81%E6%9C%89%E8%BF%87%E7%A8%8B%E6%92%92%7E%7E)
初一数学...6.4因式分解的简单应用..解方程..X^2-4X-12=0X+2X^2-15=024X-3X^2=0已知(X+Y)^2-2X-2Y+1=0,求2X^2+4XY+2Y^2的值已知a,b,c为三角形三边,试判断a^2ab+b^2-c^2大于0还是小于0还是等于0要有过程撒~~
初一数学...6.4因式分解的简单应用..解方程..
X^2-4X-12=0
X+2X^2-15=0
24X-3X^2=0
已知(X+Y)^2-2X-2Y+1=0,求2X^2+4XY+2Y^2的值
已知a,b,c为三角形三边,试判断a^2ab+b^2-c^2大于0还是小于0还是等于0
要有过程撒~~
初一数学...6.4因式分解的简单应用..解方程..X^2-4X-12=0X+2X^2-15=024X-3X^2=0已知(X+Y)^2-2X-2Y+1=0,求2X^2+4XY+2Y^2的值已知a,b,c为三角形三边,试判断a^2ab+b^2-c^2大于0还是小于0还是等于0要有过程撒~~
X^2-4X-12=0
(x-6)(x+2)=0
x=6或x=-2
X+2X^2-15=0
(x+5)(x-3)=0
x=-5或x=3
24X-3X^2=0
8x-x^2=0
x(8-x)=0
x=0或x=8
已知(X+Y)^2-2X-2Y+1=0,求2X^2+4XY+2Y^2的值
(x+y)^2-2x-2y+1=0
(x+y)^2-2(x+y)+1=0
(x+y-1)^2=0
x+y=1
2x^2+4xy+2y^2
=2(x^2+2xy+y^2)
=2(x+y)^2
=2*1^2
=2
已知a,b,c为三角形三边,试判断a^2-2ab+b^2-c^2大于0还是小于0还是等于0
a^2-2ab+b^2-c^2
=(a-b)^2-c^2
=(a-b-c)(a-b+c)(根据两边之和大于第三边,a-b-c