A=64+151+136+49;B=1x2x3+2x3x4+3x4x5+...+48x49x50
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a, 45451: x = 151
x = 45451 : 151
x = 301
b, x x 35 = 25 x 49
x x 35 = 1225
x = 1225 : 35
x = 35
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) $136^2+36^2-72.136=136^2-2.36.136+36^2=\left(136-36\right)^2=100^2=10000$
A = 2014 x (128 x 68 - 64 x 136) + 2015
A=2014x(8704-8704)+2015
A=2014x0+2015
A=0+2015
A=2015
A = 2014 x ( 128 x 68 - 64 x 136 ) + 2015
= 2014 x ( 128 x 68 - 64 x 2 x 136 : 2 ) + 2015
= 2014 x ( 128 x 68 - 128 x 68 ) + 2015
= 2014 x 0 + 2015
= 0 + 2015 = 2015
A = 2014 x ( 128 x 68 - 64 x 136 ) + 2015
A = 2014 x 0 + 2015
A = 0 + 2015
A = 2015
Chúc bạn học tốt !
= 2014 x ( 8704 - 8704 ) + 2015
= 2014 x 0 + 2015
A = 0 + 2015 = 2015