用简便方法计算1001?2;-202202+101?
编辑: admin 2017-25-02
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4
202202=1001×101×2
所以1001²-202202+101²
=1001²-2×1001×101+101²
=(1001-101)²
=900²
=810000
类似问题
类似问题1:999×999= 1001×1001=怎样用简便方法计算[数学科目]
999*999=(1000-1)*(1000-1)
=1000*1000-2*1000*1+1*1
=1000000-2000+1
=998001
1001×1001=1001×﹙1000+1﹚
=1001000+1001
=1002001
类似问题2:简便计算:101×99=______.[数学科目]
101×99
=(100+1)×(100-1)
=1002-12
=10000-1
=9999,
故答案为:9999.
类似问题3:用简便方法计算9*10的100次方-10的101次方 1297*12%-897*12% 2005²-2004*2006 999²+999*2+1[数学科目]
9*10^100-10^101
=9*10^100-10*10^100
=(9-10)10^100
=-10^100
1297*12% - 897*12%
=12%*(1297-897)
=12%*400
=48
2005^2 - 2004*2006
=2005^2-(2005-1)(2005+1)
=2005^2-(2005^2+1)
=-1
999^2+999*2+1
=(999+1)^2
=1000000
类似问题4:1001的平方-202202+101的平方 99的平方+198+1 7又4分之3×8又4分之1 1.02×0.98[数学科目]
1001的平方-202202+101的平方
=1001²-2×1001×101+101²
=(1001-101)²
=900²
=810000
99的平方+198+1
=99²+2×99×1+1²
=(99+1)²
=100²
=10000
7又4分之3×8又4分之1
=(8-1/4)(8+1/4)
=64-1/16
=63又15/16
1.02×0.98
=(1+0.02)(1-0.02)
=1²-0.02²
=1-0.0004
=0.9996
类似问题5:因式分解498^2-4,256^2-244^2,2008+2008^-2009^2,996^2-16,2005003-2003,1001^2-202202+101^2急用.好的赏30分.[数学科目]
498²-4=498²-2²
=(498+2)×(498-2)
=500×496=248000
256²-244²
=(256+244)×(256-244)
=500×12=6000
2008+2008²-2009²
=2008(2008+1)-2009²
=2008×2009-2009²
=2009×(2008-2009)
=2009×(-1)
=-2009
996²-16
=996-4²
=(996+4)×(996-4)
=1000×992
=992000
2005003-2003
=(2003000+2003)-2003
=2003000
1001²-202202+101²
=(1000+1)-202202+(100+1)²
=1000000+2000+1-202202+10000+200+1
=1010000+2000+200+2-202202
=1010000-(202202-2202)
=1010000-200000
=810000