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\(36^2+24^2+36.48\)
\(=36^2+2.36.24+24^2\)
\(=\left(36+24\right)^2=60^2=3600\)
\(-0.4\cdot\sqrt{36}=\dfrac{-2}{5}\cdot6=-\dfrac{12}{5}\)
a) \(56^2+44^2+2.56.44=56^2+2.56.44+44^2=\left(56+44\right)^2=100^2=10000\)
b) \(36^2+64^2+72.64=36^2+2.36.64+64^2=\left(36+64\right)^2=100^2=10000\)
c) \(136^2+36^2-72.136=136^2-2.36.136+36^2=\left(136-36\right)^2=100^2=10000\)
a) $56^2+44^2+2.56.44=56^2+2.56.44+44^2=\left(56+44\right)^2=100^2=10000$562+442+2.56.44=562+2.56.44+442=(56+44)2=1002=10000
b) $36^2+64^2+72.64=36^2+2.36.64+64^2=\left(36+64\right)^2=100^2=10000$362+642+72.64=362+2.36.64+642=(36+64)2=1002=10000
c) $136^2+36^2-72.136=136^2-2.36.136+36^2=\left(136-36\right)^2=100^2=10000$
\(=82^2-2.18.82+18^2=\left(82-18\right)^2=64^2=...\)
Để xem, \(64^2=2^{12}=4096\)
7 . 3 5 - 3 4 + 3 6 : 3 4 = 7 . 3 5 : 3 4 + - 3 4 : 3 4 + 3 6 : 3 4 = 7 . 3 - 1 + 3 2 = 21 - 1 + 9 = 29
a, \(36^2+26^2-52.36=36^2-2.26.36+26^2=\left(36-26\right)^2=10^2=100\)
\(b,2004^2-16^2=\left(2004-16\right)\left(2004+16\right)=1988.2020=4015760\)
\(a,36^2+26^2-52.36\)
\(=36^2-2.26.36+26^2\)
\(=\left(36-26\right)^2\)
\(=10^2=100\)
\(b,2004^2-16^2\)
\(=\left(2004-16\right)\left(2004+16\right)\)
\(=1988.2020\)
\(=4015760\)
\(118^2-118.36+18^2\)
\(=118^2-2.118.18+18^2\)
\(=\left(118-18\right)^2\)
\(=100^2=10000\)
\(118^2-118.36+18^2\)
=\(118^2-2.118.18+18^2\)
=\(\left(118-18\right)^2\)
=\(100^2\)
20062-36
=20062-62
=(2006+6).(2006-6)
=2012.2000
=4024000
2006^2-6^2=(2006-6)(2006+6)=4024000