1.Tinh nhanh tổng sau:
(123+345) + ( 456- 123)- [2017 -(-345)]
Cc giup mk vs , mk sẽ tick cho
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( 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
\(a)\left(3567-214\right)-3557\)
\(=3567-214-3567\)
\(=\left(3567-3567\right)-214\)
\(=0-214=-214\)
\(b)\left(-2017\right)-\left(28-2017\right)\)
\(=\left(-2017\right)-28+2017\)
\(=\left[\left(-2017\right)+2017\right]-28\)
\(=0-28=-28\)
\(c)-\left(269-357\right)+\left(269-357\right)\)
\(=\left(-269\right)+357+269-357\)
\(=\left[\left(-269\right)+269\right]+\left(357-357\right)\)
\(=0+0=0\)
\(d)\left(123+345\right)+\left(456-123\right)+\left[2017-\left(345\right)\right]\)
\(=123+345+456-123+2017-345\)
\(=\left(123-123\right)+\left(345-345\right)+456+2017\)
\(=0+0+456+2017\)
\(=2473\)
#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, - ( 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
(123+345) + ( 456- 123)- [2017 -(-345)]
=123+345+456-123-2017-345
=(123-123)+(345-345)+(456-2017)
=0+0-1561
=-1561
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