帮我做几个初2数学题.因式分解.1:(2x+y)平方-(x+2y)平方2:4x平方(x-y)平方-6xy平方(y-x)3:x平方-y平方+x+y
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![帮我做几个初2数学题.因式分解.1:(2x+y)平方-(x+2y)平方2:4x平方(x-y)平方-6xy平方(y-x)3:x平方-y平方+x+y](/uploads/image/z/8809655-23-5.jpg?t=%E5%B8%AE%E6%88%91%E5%81%9A%E5%87%A0%E4%B8%AA%E5%88%9D2%E6%95%B0%E5%AD%A6%E9%A2%98.%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3.1%EF%BC%9A%EF%BC%882x%2By%EF%BC%89%E5%B9%B3%E6%96%B9-%EF%BC%88x%2B2y%EF%BC%89%E5%B9%B3%E6%96%B92%EF%BC%9A4x%E5%B9%B3%E6%96%B9%EF%BC%88x-y%EF%BC%89%E5%B9%B3%E6%96%B9-6xy%E5%B9%B3%E6%96%B9%EF%BC%88y-x%EF%BC%893%EF%BC%9Ax%E5%B9%B3%E6%96%B9-y%E5%B9%B3%E6%96%B9%2Bx%2By)
帮我做几个初2数学题.因式分解.1:(2x+y)平方-(x+2y)平方2:4x平方(x-y)平方-6xy平方(y-x)3:x平方-y平方+x+y
帮我做几个初2数学题.因式分解.
1:(2x+y)平方-(x+2y)平方
2:4x平方(x-y)平方-6xy平方(y-x)
3:x平方-y平方+x+y
帮我做几个初2数学题.因式分解.1:(2x+y)平方-(x+2y)平方2:4x平方(x-y)平方-6xy平方(y-x)3:x平方-y平方+x+y
1:(2x+y)^2-(x+2y)^2
= (2x+y+x+2y)(2x+y-x-2y)
=(3x+3y)(x-y)
=3(x+y)(x-y)
2:4x^2(x-y)^2-6xy^2(y-x)
=(x-y)(4x^2 +6xy^2)
=2x(x-y)(2x+3y^2)
3:x^2-y^2+x+y
=(x+y)(x-y)+(x+y)
=(x+y)(x-y+1)
1:(2x+y)平方-(x+2y)平方
=[(2x+y)+(x+2y)][(2x+y)-(x+2y)]
=(3x+3y)(x-y)
=3(x+y)(x-y)
2:4x平方(x-y)平方-6xy平方(y-x)
=4x^2(x-y)^2+6xy^2(x-y)
=2x(x-y)[2x(x-y)+3y^2]
=2x(x-y)(2x^2-2xy+3y^2)
3:x平方-y平方+x+y
=(x+y)(x-y)+(x+y)
=(x+y)(x-y+1)
第一题:3(x+y)(x-y)
第二题做起来怪怪的```是不是你抄错了```还是我看不明白```
第三题:(x+y)(x-y+1)
1.(3x+3y)(x-y)
2.2x(x-y)(2x平方-2xy+3y平方),更深的: 4x(x-y)(x-(2y+根号(-20y平方))÷4)(x-(2y-根号(-20y平方))÷4)不太可能后一种, 不然你的题目就写错了
3.(x+y)(x-y+1)
1:(2x+y)平方-(x+2y)平方
原式=4xx+4xy+yy-xx-4xy-4yy
=3xx-3xy
=3x(x-y)
2:4x平方(x-y)平方-6xy平方(y-x)
原式=4xx(x-y)(x-y)+6xyy(x-y)
=2x(x-y)[2x(x-y)+3yy]
=2x(x-y)(2xx-2xy+3yy)
全部展开
1:(2x+y)平方-(x+2y)平方
原式=4xx+4xy+yy-xx-4xy-4yy
=3xx-3xy
=3x(x-y)
2:4x平方(x-y)平方-6xy平方(y-x)
原式=4xx(x-y)(x-y)+6xyy(x-y)
=2x(x-y)[2x(x-y)+3yy]
=2x(x-y)(2xx-2xy+3yy)
=
3:x平方-y平方+x+y
原式=(x+y)(x-y)=(x+y)
=(x+y)(x-y+1)
收起
1:(2x+y)^2-(x+2y)^2
=(2X+y+x+2y)(2x+y-x-2y)
=(3x+3y)(x-y)
=3(x+y)(x-y)
=3(x^2-y^2)
2.4x^2(x-y)^2-6xy^2(y-x)
=4x^2(x-y)^2+6xy^2(x-y)
=2x(x-y)[2x(x-y)+3y^2]
全部展开
1:(2x+y)^2-(x+2y)^2
=(2X+y+x+2y)(2x+y-x-2y)
=(3x+3y)(x-y)
=3(x+y)(x-y)
=3(x^2-y^2)
2.4x^2(x-y)^2-6xy^2(y-x)
=4x^2(x-y)^2+6xy^2(x-y)
=2x(x-y)[2x(x-y)+3y^2]
=2x(x-y)(2x^2-2xy+3y^2)
3.x^2-y^2+x-y
=(x+y)(x-y)+(x-y)
=(x-y)(x+y+1)
第二个题不知对不对,我十字相乘法掌握的不好,(2x^2-2xy+3y^2) 布置还能不能分解。请楼主好好看看。
收起
1 3(x+y)(x-y)
2 2x(x-y)(2x^2-2xy+3y^2)
3 (x+y)(x-y+1)