三道题。一百悬赏纸上写过程
3个回答
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(1)原式=3x² + 3x + x² - 4
=4x² + 3x - 4
=4•1² + 3•1 - 4
=4+3-4=3
(2)原式=(y+2x)(y-2x)-(x+2y)(x-2y)
=y² - 4x² - (x² - 4y²)
=y² - 4x² - x² + 4y²
=5y² - 5x²
=5(y+x)(y-x)
=5•(6+4)•(6-4)
=5•10•2=100
12、原式=(4-1)(4+1)(4²+1)(4^4 + 1).......(4^32 + 1)+1
=(4²-1)(4²+1)(4^4 + 1).....(4^32 + 1) + 1
=(4^4 - 1)(4^4 + 1).....(4^32 + 1) + 1
........
=(4^32 - 1)(4^32 + 1) + 1
=4^64 - 1 + 1
=4^64
=4x² + 3x - 4
=4•1² + 3•1 - 4
=4+3-4=3
(2)原式=(y+2x)(y-2x)-(x+2y)(x-2y)
=y² - 4x² - (x² - 4y²)
=y² - 4x² - x² + 4y²
=5y² - 5x²
=5(y+x)(y-x)
=5•(6+4)•(6-4)
=5•10•2=100
12、原式=(4-1)(4+1)(4²+1)(4^4 + 1).......(4^32 + 1)+1
=(4²-1)(4²+1)(4^4 + 1).....(4^32 + 1) + 1
=(4^4 - 1)(4^4 + 1).....(4^32 + 1) + 1
........
=(4^32 - 1)(4^32 + 1) + 1
=4^64 - 1 + 1
=4^64
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