-4分之1x的4次方+9y²,x²-(x-y),已知4m+3n=90,2m-3n=10,
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-4分之1x的4次方+9y²,x²-(x-y),已知4m+3n=90,2m-3n=10,
求(m+2n)²-(3m-n)²的值,-4分之1x²y²+0.09,4x²-(x-y),101²-99²,
求(m+2n)²-(3m-n)²的值,-4分之1x²y²+0.09,4x²-(x-y),101²-99²,
![-4分之1x的4次方+9y²,x²-(x-y),已知4m+3n=90,2m-3n=10,](/uploads/image/z/16726650-42-0.jpg?t=-4%E5%88%86%E4%B9%8B1x%E7%9A%844%E6%AC%A1%E6%96%B9%2B9y%26%23178%3B%2Cx%26%23178%3B-%28x-y%29%2C%E5%B7%B2%E7%9F%A54m%2B3n%3D90%2C2m%EF%BC%8D3n%EF%BC%9D10%2C)
-1/4x^4+9y²
=-(x/2+3y)(x/2-3y)
x²-(x-y)²
=(x+x-y)(x-x+y)
=(2x-y)y
已知4m+n=90,2m-3n=10,
(m+2n)²-(3m-n)²
=(m+2n+3m-n)(m+2n-3m+n)
=(4m+n)(-2m+3n)
=90×(-10)
=-900
-1/4x²y²+0.09
=-(x/2+0.3)(x/2-0.3),
x²-(x-y)²
=(x+x-y)(x-x+y)
=(2x-y)y
101²-99²
=(101+99)(101-99)
=200×2
400
再问: 4x²-(x-y)
再答: 4x²-(x-y)不能分解因式,可以是少了个平方。 这道题是正规教参上的题目吗?
再问: 4x²-(x-y)²
再答: 前面已写了两遍 再复制粘贴一遍 x²-(x-y)² =(x+x-y)(x-x+y) =(2x-y)y
=-(x/2+3y)(x/2-3y)
x²-(x-y)²
=(x+x-y)(x-x+y)
=(2x-y)y
已知4m+n=90,2m-3n=10,
(m+2n)²-(3m-n)²
=(m+2n+3m-n)(m+2n-3m+n)
=(4m+n)(-2m+3n)
=90×(-10)
=-900
-1/4x²y²+0.09
=-(x/2+0.3)(x/2-0.3),
x²-(x-y)²
=(x+x-y)(x-x+y)
=(2x-y)y
101²-99²
=(101+99)(101-99)
=200×2
400
再问: 4x²-(x-y)
再答: 4x²-(x-y)不能分解因式,可以是少了个平方。 这道题是正规教参上的题目吗?
再问: 4x²-(x-y)²
再答: 前面已写了两遍 再复制粘贴一遍 x²-(x-y)² =(x+x-y)(x-x+y) =(2x-y)y
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