563 + 234 + 377 + 466

                                       = (563 + 377) + (234 + 466)

                                       = 940 + 700

                                       = 1640

                                      Tính thử lại đi sai rùi đó

\(563+234+377+466\)

\(\Rightarrow\left(563+377\right)+\left(234+466\right)\)

\(\Rightarrow940+700\)

\(\Rightarrow1640\)

\(HT\)

123 +123= 246

234+123 = 234 + 123

123+123=246

234+123=234+123

a) ( 3567 -214) - 3567

= 3567 - 214 -3567

= ( 3567-3567) - 214

= - 214

b) ( -2017) -( 28-2017)

= -2017 - 28 + 2017

= ( -2017 + 2017) -28

= 0 - 28

= -28

a, -(269-357)+(269-357).

=-269+357+269-357.

=0.

b,(123+345)+(456-123)-[2017-(-345)].

=123+345+456-123-2017-345.

=-1561.

a) - ( 269 - 357 ) + ( 269 - 357 ) 

 = - 269 + 357 + 269 - 357 

 = [( - 269  ) + 269 ] + [(-357) + 357 ]

 = 0 + 0

 = 0

b) ( 123 + 345 ) + ( 456 - 123 ) - [ 2017 - ( -345 ) ]

  = 123 + 345 + 456 - 123 - [ 2017 + 345 ]

  = 123 + 345 + 456 - 123 -  2017 - 345 

   = ( 123 - 123 ) +  ( 345 - 345 ) + 456 - 2017

   = 0 + 0 + ( - 1561 )

   = ( - 1561 )

@ Học tốt @

Nhớ k cho mình nha !!!!! Thank

=1445664

\(a)\left(3567-214\right)-3557\)

\(=3567-214-3567\)

\(=\left(3567-3567\right)-214\)

\(=0-214=-214\)

\(b)\left(-2017\right)-\left(28-2017\right)\)

\(=\left(-2017\right)-28+2017\)

\(=\left[\left(-2017\right)+2017\right]-28\)

\(=0-28=-28\)

\(c)-\left(269-357\right)+\left(269-357\right)\)

\(=\left(-269\right)+357+269-357\)

\(=\left[\left(-269\right)+269\right]+\left(357-357\right)\)

\(=0+0=0\)

\(d)\left(123+345\right)+\left(456-123\right)+\left[2017-\left(345\right)\right]\)

\(=123+345+456-123+2017-345\)

\(=\left(123-123\right)+\left(345-345\right)+456+2017\)

\(=0+0+456+2017\)

\(=2473\)

#Mạt Mạt#

234 + 234 - 123

= 468 - 123

= 345

234+234-123=345

tk nhé

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