(3X-2Y)²-(2X-Y)(2X-3Y)+(2X+Y)(2X-Y)把下列各试因式分解1.(a-4)²-2a+82.m²+n²-2mn3.x²-5x+6用带入消元法解方程组1.{3x+y=52x-3y=-42.{2x-y=53x+4y=2
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![(3X-2Y)²-(2X-Y)(2X-3Y)+(2X+Y)(2X-Y)把下列各试因式分解1.(a-4)²-2a+82.m²+n²-2mn3.x²-5x+6用带入消元法解方程组1.{3x+y=52x-3y=-42.{2x-y=53x+4y=2](/uploads/image/z/15097815-63-5.jpg?t=%EF%BC%883X-2Y%EF%BC%89%26sup2%3B-%EF%BC%882X-Y%EF%BC%89%EF%BC%882X-3Y%EF%BC%89%2B%EF%BC%882X%2BY%EF%BC%89%EF%BC%882X-Y%EF%BC%89%E6%8A%8A%E4%B8%8B%E5%88%97%E5%90%84%E8%AF%95%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A31.%EF%BC%88a-4%29%26sup2%3B-2a%2B82.m%26sup2%3B%2Bn%26sup2%3B-2mn3.x%26sup2%3B-5x%2B6%E7%94%A8%E5%B8%A6%E5%85%A5%E6%B6%88%E5%85%83%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%841.%7B3x%2By%3D52x-3y%3D-42.%7B2x-y%3D53x%2B4y%3D2)
(3X-2Y)²-(2X-Y)(2X-3Y)+(2X+Y)(2X-Y)把下列各试因式分解1.(a-4)²-2a+82.m²+n²-2mn3.x²-5x+6用带入消元法解方程组1.{3x+y=52x-3y=-42.{2x-y=53x+4y=2
(3X-2Y)²-(2X-Y)(2X-3Y)+(2X+Y)(2X-Y)
把下列各试因式分解
1.(a-4)²-2a+8
2.m²+n²-2mn
3.x²-5x+6
用带入消元法解方程组
1.{3x+y=5
2x-3y=-4
2.{2x-y=5
3x+4y=2
(3X-2Y)²-(2X-Y)(2X-3Y)+(2X+Y)(2X-Y)把下列各试因式分解1.(a-4)²-2a+82.m²+n²-2mn3.x²-5x+6用带入消元法解方程组1.{3x+y=52x-3y=-42.{2x-y=53x+4y=2
9X²-12XY+4Y²-(4X²-6XY-2XY+3Y²)+(4X²-2XY+2XY-Y²)
9X²-4XY
因式分解
1.(a-4)(a-6)
2.(m-n)²
3.(x-6)(x+1)
消元法
1.{6X+2Y=10 (方法:先把X(或Y)前的系数取相同值,先消元X,求出Y.)
6X-9Y=-12
2Y-(-9Y)=22 →Y=2
代入:X=1
2.下面一题自已解吧.