因式分解 有几题不会做 25b³-80b²+64b=x²-4(x-1)=16x⁴-72x²y²+81y⁴87²+87×26+13²
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因式分解 有几题不会做 25b³-80b²+64b=x²-4(x-1)=16x⁴-72x²y²+81y⁴87²+87×26+13²
因式分解 有几题不会做
25b³-80b²+64b=
x²-4(x-1)=
16x⁴-72x²y²+81y⁴
87²+87×26+13²
因式分解 有几题不会做 25b³-80b²+64b=x²-4(x-1)=16x⁴-72x²y²+81y⁴87²+87×26+13²
25b³-80b²+64b
=b(25b²-80b+64)
=b(5b-8)²
x²-4(x-1)
=x²-4x+4
=(x-2)²
16x⁴-72x²y²+81y⁴
=(4x²-9y²)²
=(2x+3y)²(2x-3y)²
87²+87×26+13²
=(87+13)²
=100²
=10000