公式分解 1+a+b+4分之1(a+b)²1+a+b+4分之1(a+b)²(m+n)-4n²25(3x-y)²-36(3x+y)²7.77²+4.46*7.77+2.23²(a²+b²-c²)²-4a²b²
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![公式分解 1+a+b+4分之1(a+b)²1+a+b+4分之1(a+b)²(m+n)-4n²25(3x-y)²-36(3x+y)²7.77²+4.46*7.77+2.23²(a²+b²-c²)²-4a²b²](/uploads/image/z/5219721-9-1.jpg?t=%E5%85%AC%E5%BC%8F%E5%88%86%E8%A7%A3+1%2Ba%2Bb%2B4%E5%88%86%E4%B9%8B1%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B1%2Ba%2Bb%2B4%E5%88%86%E4%B9%8B1%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B%EF%BC%88m%2Bn%29-4n%26%23178%3B25%EF%BC%883x-y%EF%BC%89%26%23178%3B-36%EF%BC%883x%2By%EF%BC%89%26%23178%3B7.77%26%23178%3B%2B4.46%2A7.77%2B2.23%26%23178%3B%EF%BC%88a%26%23178%3B%2Bb%26%23178%3B-c%26%23178%3B%EF%BC%89%26%23178%3B-4a%26%23178%3Bb%26%23178%3B)
公式分解 1+a+b+4分之1(a+b)²1+a+b+4分之1(a+b)²(m+n)-4n²25(3x-y)²-36(3x+y)²7.77²+4.46*7.77+2.23²(a²+b²-c²)²-4a²b²
公式分解 1+a+b+4分之1(a+b)²
1+a+b+4分之1(a+b)²
(m+n)-4n²
25(3x-y)²-36(3x+y)²
7.77²+4.46*7.77+2.23²
(a²+b²-c²)²-4a²b²
公式分解 1+a+b+4分之1(a+b)²1+a+b+4分之1(a+b)²(m+n)-4n²25(3x-y)²-36(3x+y)²7.77²+4.46*7.77+2.23²(a²+b²-c²)²-4a²b²
1.
1+a+b+(a+b)²/4
=[1+(a+b)/2]²
=(a+b+2)²/4
2.
(m+n)-4n²是不是漏平方符号了?
3.
25(3x-y)²-36(3x+y)²
=[5(3x-y)+6(3x+y)][5(3x-y)-6(3x+y)]
=(33x+y)(-3x-11y)
=-(33x+y)(3x+11y)
4.
7.77²+4.46*7.77+2.23²
=(7.77+2.23)²
=10²
=100
5.
(a²+b²-c²)²-4a²b²
=(a²+b²-c²+2ab)(a²+b²-c²-2ab)
=[(a+b)²-c²][(a-b)²-c²]
=(a+b+c)(a+b-c)(a-b+c)(a-b-c)
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1+a+b+4分之1(a+b)²
=1+2*1/2(a+b)+(a+b)^2
=(1+1/2a+1/2b)^2
(m+n)^2-4n²
=(m+n+2n)(m+n-2n)
=(m+3n)(m-n)
25(3x-y)²-36(3x+y)²
=[2(3x-y)+6(3x+y)][2(3x-y)-6(3x+y...
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1+a+b+4分之1(a+b)²
=1+2*1/2(a+b)+(a+b)^2
=(1+1/2a+1/2b)^2
(m+n)^2-4n²
=(m+n+2n)(m+n-2n)
=(m+3n)(m-n)
25(3x-y)²-36(3x+y)²
=[2(3x-y)+6(3x+y)][2(3x-y)-6(3x+y)]
=(6x-2y+18x+6y)(6x-2y-18x-6y)
=(24x+4y)(-12x-8y)
7.77²+4.46*7.77+2.23²
=(7.77+2.33)^2
=10^2
=100
(a²+b²-c²)²-4a²b²
=(a^2+b^2-c^2+2ab)(a^2+b^2-c^2-2ab)
=[(a+b)^2-C^2][(a-b)^2-c^2]
=(a+b+c)(a+b-c)(a-b+c)(a-b-c)
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