计算(1)(5ab-3xy)(-3xy-5ab)(2)(-2a²+56³)²(3)x(9x-5)-(3x+1)(3x-1)(4)(a-2b+1)²
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计算(1)(5ab-3xy)(-3xy-5ab)(2)(-2a²+56³)²(3)x(9x-5)-(3x+1)(3x-1)(4)(a-2b+1)²
计算(1)(5ab-3xy)(-3xy-5ab)(2)(-2a²+56³)²(3)x(9x-5)-(3x+1)(3x-1)(4)(a-2b+1)²
计算(1)(5ab-3xy)(-3xy-5ab)(2)(-2a²+56³)²(3)x(9x-5)-(3x+1)(3x-1)(4)(a-2b+1)²
(1)=-15abxy-25a²b²+9x²y²+15abxy=-16x²y²
(2)=4倍a的四次幂加上56的六次幂
(3)9x²-5x-9x²+1=-8x+1
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