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1.2^2008/2^2007-2^20092.16(x-1)^2-9(x+2)^23.1.222^2*9-1.333^2*4
题目详情
1.2^2008/2^2007-2^2009 2.16(x-1)^2-9(x+2)^2 3.1.222^2*9-1.333^2*4
▼优质解答
答案和解析
2^2008/(2^2007-2^2009)
=2*2^2007/(2^2007-2^2*2^2007)
=2*2^2007/[2^2007(1-4)]
=2/(1-4)
=-2/3
16(x-1)^2-9(x+2)^2
=[4(x-1)-3(x+2)][4(x-1)+3(x+2)]
=(4x-4-3x-6)(4x-4+3x+6)
=(x-10)(7x+2)
1.222^2*9-1.333^2*4
=(1.222*3-1.333*2)(1.222*3+1.333*2)
=(3.666-2.666)(3.666+2.666)
=3.666+2.666
=6.332
=2*2^2007/(2^2007-2^2*2^2007)
=2*2^2007/[2^2007(1-4)]
=2/(1-4)
=-2/3
16(x-1)^2-9(x+2)^2
=[4(x-1)-3(x+2)][4(x-1)+3(x+2)]
=(4x-4-3x-6)(4x-4+3x+6)
=(x-10)(7x+2)
1.222^2*9-1.333^2*4
=(1.222*3-1.333*2)(1.222*3+1.333*2)
=(3.666-2.666)(3.666+2.666)
=3.666+2.666
=6.332
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