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a) (125 - 679 + 145) - (125 - 679)
= 125 - 679 + 145 - 125 + 679
= ( 125 - 125) - (679 - 679) + 145
= 0 - 0 + 145
= 145
a, (125 - 679 + 145) - (125 - 679)
125-679+145-125+679
=(125-125)+(-679+679)+145
=0+0+145
=145
b, -37 + 54 + (-70) + (-163) + 246
=[-37+(-70)+(-163)]+(54+246)
=[-107+(-163)]+300
=-270+300
=30
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
(2021 - 13) - (2021 + 11) = 2021 - 13 - 2021 - 11 = (2021 - 2021) - ( 13 + 11 ) = 0 + ( - 24) = -24
Ta có:\(\left(2021-13\right)-\left(2021+11\right)\)
\(=2021-13-2021-11\)
\(=-13-11\)
\(=-24\)
a, 568 + 568 x 135 - 568 x 36
= 568 x ( 1 + 135 - 36)
= 568 x 100
56 800
b, 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51)
= 54 x 100
= 5 400
c, 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= ( 2 x 35) x ( 7 x 5) + ( 10 x 7) x 25 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x ( 35 + 25 + 20)
= 70 x 80
= 5 600
a) 568 + 568 x 135 - 568 x 36
= 568 x ( 1+1+135-1-36 )
=568 x 100
=5680
b) 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37 ) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51 )
= 54 x 100
= 5400
c) 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= 70 x 35 + 10 x 25 x 7+ 20 x 70
= 70 x 35 + 250 x 7 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x (35+25+20)
= 70 x 80
= 5600
a, \(S=\left(45-3756\right)+3756=45-\left(3756-3756\right)=45-0=45\)
b, \(V=\left(-2021\right)-\left(199-2021\right)=\left(\left(-2021\right)+2021\right)-199=0-199=-199\)
ta có
\(C=2020\times\left(2021^9+2021^8+...+2021^2+2021^1+1\right)+1\)
\(2020\times\frac{2021^{10}-1}{2021-1}+1=2021^{10}-1+1=2021^{10}\)
a) ( 17 - 229 ) + ( 17 - 25 + 229 )
= 17 - 229 + 17 - 25 + 229
= 34 - 25
= 9
b) ( 125 - 679 + 145 ) - ( 125 - 679 )
= 125 - 679 + 145 - 125 - 679
= ( 125 - 125 ) - ( 679 - 679 ) + 145
= 0 + 145
= 145
a)( 17-229)+(17-25+229)
=17-229+17-25+229
=34-25
=9
b)(125-679+145)-(125-679)
=125-679+145-125+679
=145
2019 . 2021 - 2020. 2020
= 2019(2020+1) - 2020( 2019+1)
= 2019 .2020 + 1.2019 - 2020.2019 + 1.2020
= 2019 -2020
= -1
\(2019.2021-2020.2020\)
\(=2019\left(2020+1\right)-2020\left(2019+1\right)\)
\(=2019.2020+2019-2020.2019+2020\)
\(=2019-2020\)
\(=-1\)
a)
17-229+17-25+229
=34-25+0
=9
b)
125-679+145-125+679
= 0 + 145 + 0
=145
a)17-229+17-25+229 b)125-679+145-125-629
=(17-17)+(229-229)+25 =(125-125)+(679-679)+145
=0+0+25 = 0+0+145
25 =145
2021-(568-679)
=2021-568+679
=(2021+679)-568
=2700-568
=2132
tính trong ngoặc trước
2021-(-111)= kết quả