a) 1012=(100+1)2=1002+2.50.2+12=10000+200+1=10201
b)1992=(200-1)2=2002 -2.200.1+12=40000-400+1=39601
c) 47.53=(50-3)(50+3)=502-32=2500-9=2491
a) 1012 =(100+1)2 =10000+1=10001
b) 1992 =(199+1)2 =2002 =40000
c) 47.53=(40+7 .50+3)=20000+10=20010
rất đơn giản chưa thấy ai đúng
\(101^2=\left(100+1\right)^2=100^2+2.100+1=10201\)
Bài giải:
a) 1012 = (100 + 1)2 = 1002 + 2 . 100 + 1 = 10201
b) 1992= (200 – 1)2 = 2002 – 2 . 200 + 1 = 39601
c) 47.53 = (50 – 3)(50 + 3) = 502 – 32 = 2500 – 9 = 2491.
Bài giải:
a) 1012 = (100 + 1)2 = 1002 + 2 . 100 + 1 = 10201
b) 1992= (200 – 1)2 = 2002 – 2 . 200 + 1 = 39601
c) 47.53 = (50 – 3)(50 + 3) = 502 – 32 = 2500 – 9 = 2491.
\(a)101^2=10201\)
\(b)199^2=39601\)
\(c)47.53=\left(50-3\right).\left(50+3\right)=50^2-3^2=2500-9=2491\)
