关于公式(a+b)(a-b)=a^(2)-b^(2)的数学题 求高手帮忙 急
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发布时间:2023-05-27 18:09
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热心网友
时间:2024-12-13 05:16
(1-1/2^(2))(1-1/3^(2))(1-1/4^(2))…(1-1/9^(2))(1-1/10^(2))
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4).......(1-1/9)(1+1/9)(1-1/10)(1+1/10)
=1/2*3/2*2*3*4/3*3/4*4/5*5/4*......*8/9*10/9*9/10*11/10
=1/2*11/10
=11/20
(2+1)(2^(2)+1)(2^(4)+1)…(2^(16)+1)(2^(32)+1)
=(2-1)(2+1)(2^(2)+1)(2^(4)+1)…(2^(16)+1)(2^(32)+1)
=(2²-1)(2²+1)(2^(4)+1)…(2^(16)+1)(2^(32)+1)
=(2^4-1)(2^(4)+1)…(2^(16)+1)(2^(32)+1)
=(2^8-1))…(2^(16)+1)(2^(32)+1)
=......
=2^64-1
第n个等式的表达式为:(n+2)²-n²=n²+4n+4-n²=4n+4
已知S=1方-2方+3方-4方…+99方-100方+101方,则S被103除的余数为:(1)
∵S=1方-2方+3方-4方…+99方-100方+101方
=1²+(3-2)(3+2)+(5-4)(5+4)+.....+(99-98)(99+98)+(101-100)(101+100)
=1+2+3+4+5+6+7+.....+98+99+100+101
=5151
∴5151÷103=50....1
已知x方-x+2=0,求【1+(4/x方-4)】(x+2)的值
∵x²-x+2=0
∴x²=x-2
【1+(4/x方-4)】(x+2)
=(x²-4+4)/(x-2)(x+2)*(x+2)
=x²/(x-2)
=(x-2)/(x-2)
=1
热心网友
时间:2024-12-13 05:17
一、
(1-1/2^(2))(1-1/3^(2))(1-1/4^(2))…(1-1/9^(2))(1-1/10^(2))
=[(1-1/2)(1+1/2)][(1-1/3)(1+1/3)]...[(1-1/10)(1+1/10)]
=1/2×3/2×2/3×4/3×...×9/10×11/10
=1/2×1×...×1×11/10
=11/20
二、
(2+1)(2^(2)+1)(2^(4)+1)…(2^(16)+1)(2^(32)+1)
=1×(2+1)(2^(2)+1)(2^(4)+1)…(2^(16)+1)(2^(32)+1)
=(2-1)(2+1)(2^(2)+1)(2^(4)+1)…(2^(16)+1)(2^(32)+1)
=(2^2-1)(2^(2)+1)(2^(4)+1)…(2^(16)+1)(2^(32)+1)
=...
=(2^32-1)(2^32+1)
=2^64-1
三、
(n+2)^2-n^2
=(n+2+n)(n+2-n)
=4(n+1)
四、追问我只想说(1-1/2^(2))是 一减去二分之一的二次方 以此类推
追答你先把题目仔细看看
再把解题过程仔细看看
热心网友
时间:2024-12-13 05:17
第一题:原式=(2^2-1)/2^……额 ,我想问问 2^(2)是2的平方的意思吧追问^(2)括号里实际 就是多少平方