tính nhanh (56. 64)
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\(64\times56+81\times44+17\times56\)
\(=\left(64+17\right)\times56+81\times44\)
\(=81\times56+81\times44\)
\(=81\times\left(56+44\right)\)
\(=81\times100\)
\(=8100\)
Học tốt #
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\(64\cdot56+81\cdot44+17\cdot56\)
\(=56\left(64+17\right)+81\cdot44\)
\(=56\cdot81+44\cdot81\)
\(=81\left(56+44\right)\)
\(=81\cdot100\)
\(=8100\)
hok tốt nhé!
![](https://rs.olm.vn/images/avt/0.png?1311)
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) $136^2+36^2-72.136=136^2-2.36.136+36^2=\left(136-36\right)^2=100^2=10000$
![](https://rs.olm.vn/images/avt/0.png?1311)
20+36+42+52+56+64+67
=( 36+64)+(52 + 42 + 56 ) + 20+67
=100 + 150 + 20 + 67
= 250 + 20 + 67
= 270 + 67
= 337
![](https://rs.olm.vn/images/avt/0.png?1311)
78 - 64 - 88 + 22 + 42 + 56
= 14 - 88 + 22 + 42 + 56
= -74 + 22 + 42 + 56
= -52 + 42 + 56
= -10 + 56
= 46
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 483 + (-56) + 263 + (-64)
= (483 + 263) + (-56 + - 64)
= 746 + -( 56 + 64)
= 746 + -120
=626.
Tick cho mình nhé. Thank
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 64 x 7 + 81 x 93 + 17 x 7
= 7 x ( 64 + 17 ) + 81 x 93
= 7 x 81 + 81 x 93
= 81 x ( 93 + 7 )
= 81 x 100
= 8100
a) 64 x 7 + 81 x 93 + 17 x 7
= 7 x ( 64 + 17 ) + 81 x 93
= 7 x 81 + 81 x 93
= 81 x ( 7 + 93 )
= 81 x 100
= 8100
56. 64 = ( 60 - 4 )( 6 0 + 4 ) = 60^2 - 4^2
= 3600 - 14
= 3584
3584 AI CÓ LÒNG TỐT CHO LIK-E