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

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

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

= 0 + 0 + 456 - 2017

= 456 - 2017 = -1561

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

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

=0+0+(-1561)

=-1561

=1561

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

\(=3567-214-3567\)

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

\(=0-214=-214\)

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

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

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

\(=0-28=-28\)

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

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

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

\(=0+0=0\)

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

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

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

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

\(=2473\)

#Mạt Mạt#

123+345+456-123-2017-345

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

= 0 + 0 - 2140

= -2140

Trả lời :

( 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

Hok tốt

a, (3567-214)-3567

=3567-214-3567

=-214

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

=(-2017)-28+2017

=-28

c,-(269-357)+(269-357)

=-269+357+269-357

=0

d,

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

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

=456-2017=-1561

a.3567-214-3567

=3567-3567-214

=0-214

=-214

b.-2017-28+2017

=(-2017)+2017-28

=0-28

=-28

c.-269+357+269-357

=(-269+269)+(357-357)

=0+0

=0

d.(123+345)+(456-123)-[2017+345]

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

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

=0+0-1561

=-1561

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

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

c) \(-\left(269-357\right)+\left(269-357\right)=0\)

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

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

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

\(=-1561\)

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

= - 269 + 357 + 269 - 357

= ( -269 + 269) + ( 357 - 357)

= 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

c, ( 17 - 229 ) + ( 17 - 25 + 229 )

= 17 - 229 + 17 - 25 + 229

= ( 17 + 17 ) + ( -229 + 229 ) - 25

= 34 + 0 - 25

=  9

d, ( 125 - 679 + 145 ) - ( 125 - 679 )

= 125 - 679 + 145 - 125 + 679

= ( 125 - 125 ) + (-679 + 679 ) + 145

= 0 + 0 + 145

= 145

a) (-2017)- (28- 2017)

= -2017 -28 +2017

= (-2017 +2017) -28

= 0 -28

= -28

b) (17-299) +(17-26+299)

=17 -229 +17 -25 +229

=(17 +17) -(229 +229) -25

=34 -0 -25

=9

c) - (269 -357) + (269 -357)

=-269 +357 +269 -357

=(-269 +269) +(357 -357)

= 0 +0 =0

d) (123 +345)  + (456 -1230 - (2017 - (-345)))

=123 +345 +456 -1230 -2017 -345

=(345 -345) + (123 -1230) + (456 -2017)

=0 + (-1107) + (--1561)

= -2668

1

a, (x + 17)- (24+35)

=x + 17 -24-35

=x+ ( -7) - 35

=x+(-42)

b, (-32) - ( y+ 20) +20

=-32-y-20+20

=-32-y + (-20) + 20

=-32-y + 0

=-32-y

Vậy.......

2.

a.(3567-214)-3567                                                     b.(-2017)-(28-2017)

=3567-214-3567                                                       =-2017-28+2017

=(3567-3567)-214                                                     =(-2017+2017)-28

=0-214                                                                       = 0 -28

=-214                                                                         =-28

c.(269-357)+(269-357)                               d.(123+345)+(456-123)-[2017-(-345)]

=-269-357+269-357                                  =123+345+456-123-[2017+345]

=(-269+269)-(357+357)                            =0+345+456-2017-345

=0-714                                                      =456-2017

=-714                                                        =-1561

Học Tốt

# mui #

1. Đơn giản biểu thức:
a) ( x + 17) - ( 24 + 35)

       x + 17 - 24 - 35

        x + ( -42)

b) ( -32) - ( y + 20) + 20

     - 32  - y - 20 +20

     - 32 - y + 0

     - y - 32

2. Tính nhanh các tổng sau:

a) ( 3567 - 214 ) - 3567

=  3567 - 214 - 3567

=  ( 3567 - 3567 ) - 214

=          0        -   214

=   -214

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

=  -2017 - 28 + 2017

= ( 2017 - 2017 ) -28

= -28

c) -(269 - 357) + ( 269- 357)

= - 269 + 357 + 269 - 357

= ( 269 - 269 ) + ( 357 - 357)

=         0          +        0

= 0

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

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

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

=  0 

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

= 123 + 345 + 456 - 123 - 2017 - 345 

= 456 - 2017

= -1561

!! Hơi tắt 

@@ Học tốt @@
## Chiyuki Fujito