[(5x-4)平方+9]×[(4x-5)平方]÷(3x)平方=?
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[(5X-4)²+9]×(4X-5)²÷(3X)²
={[(5X-4)×(4X-5)]²+9(4X-5)²}÷9X²
=[(20X²-41X+20)²+9(16X²-40X+25)]÷9X²
=[(400X⁴+1681X²+400-1640X³+800X²-1640X)+(144X²-360X+225)]÷9X²
=(400X⁴-1640X³+2625X²-2000X+625)÷9X²
=400/9X²-1640/9X+2625/9-2000/(9X)+625/(9X²)
={[(5X-4)×(4X-5)]²+9(4X-5)²}÷9X²
=[(20X²-41X+20)²+9(16X²-40X+25)]÷9X²
=[(400X⁴+1681X²+400-1640X³+800X²-1640X)+(144X²-360X+225)]÷9X²
=(400X⁴-1640X³+2625X²-2000X+625)÷9X²
=400/9X²-1640/9X+2625/9-2000/(9X)+625/(9X²)
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