(321*321-123*123)/(543*543-345*345)要详细过程

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(321*321-123*123)/(543*543-345*345)要详细过程

(321*321-123*123)/(543*543-345*345)要详细过程
(321*321-123*123)/(543*543-345*345)要详细过程

(321*321-123*123)/(543*543-345*345)要详细过程
原式=(222+99)²-(222-99)²/(444+99)²-(444-99)²
=【(222²+2*222*99+99²)-(222²-2*222*99+99²)】/【(444²+2*444*99+99²)-(444²-2*444*99+99²)】
=(222²+2*222*99+99²-222²+2*222*99-99²)/(444²+2*444*99+99²-444²+2*444*99-99²)
=(4*222*99)/(4*444*99)
=1/2