a) 345:1
b)6701+123=
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a) \(=\frac{3}{17}-\frac{2}{345}+\frac{5}{12}+\frac{2}{345}-\frac{3}{17}+\frac{1}{12}\)
\(=\left(\frac{3}{17}-\frac{3}{17}\right)+\left(\frac{2}{345}-\frac{2}{345}\right)+\left(\frac{5}{12}+\frac{1}{12}\right)\)
\(=\frac{6}{12}=\frac{1}{2}\)
b) \(=-\frac{49}{25}-\frac{5}{36}+\frac{4}{123}+\frac{49}{25}-\frac{4}{123}-\frac{1}{36}\)
\(=\left(-\frac{49}{25}+\frac{49}{25}\right)+\left(\frac{4}{123}-\frac{4}{123}\right)-\left(\frac{5}{36}+\frac{1}{36}\right)\)
\(=-\frac{6}{36}=-\frac{1}{6}\)
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
\(a)\left(3567-214\right)-3557\)
\(=3567-214-3567\)
\(=\left(3567-3567\right)-214\)
\(=0-214=-214\)
\(b)\left(-2017\right)-\left(28-2017\right)\)
\(=\left(-2017\right)-28+2017\)
\(=\left[\left(-2017\right)+2017\right]-28\)
\(=0-28=-28\)
\(c)-\left(269-357\right)+\left(269-357\right)\)
\(=\left(-269\right)+357+269-357\)
\(=\left[\left(-269\right)+269\right]+\left(357-357\right)\)
\(=0+0=0\)
\(d)\left(123+345\right)+\left(456-123\right)+\left[2017-\left(345\right)\right]\)
\(=123+345+456-123+2017-345\)
\(=\left(123-123\right)+\left(345-345\right)+456+2017\)
\(=0+0+456+2017\)
\(=2473\)
#Mạt Mạt#
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) x – 123 = 345 b) x + 254 = 665
x = 345 + 123 x = 665 – 254
x = 468 x = 211
(123+345) + ( 456- 123)- [2017 -(-345)]
=123+345+456-123-2017-345
=(123-123)+(345-345)+(456-2017)
=0+0-1561
=-1561
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) 345:1=345
b)6701+123= 6824