99*99+199=99^2+2*99+1=(99+1)^2=100^2=10^4.1.计算:999*999+1999=___________=_________=__________=__
999*999+1999=999^2+2*999+1=(999+1)^2=1000^2=10^5
外加解释
999*999+1999=
999^2+2*999+1=
999*999+2*999+1= 提公因式
999*(999+2)+1=
999*1001+1=
999*1000+999+1=
999*1000+1000=
(999+1)^2=
1000^2=
10^5
????????????万人呢?10^6
=(999^2+999x2+1=(999+1)^2=1000^2=100^4
=999^2+2 X 999+1=(999+1)^2=1000^2=10^6
=999^2+999*2*1+1^2=(999+1)^2=1000^2=10^6
阅读下列计算过程:99×99+199=992+2×99+1=(99+1)2=1002=104
(1)计算:
999×999+1999=
9992+2×999+1==
(999+1)2=
10002=
106;
9999×9999+19999=
99992+2×9999+1=
(9999+1)2=
100002=