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a: \(-7264+\left(1543+7264\right)\)
\(=-7264+1543+7264\)
\(=\left(-7264+7264\right)+1543\)
=0+1543
=1543
b: \(\left(144-97\right)-144\)
\(=144-97-144\)
\(=\left(144-144\right)-97\)
=0-97
=-97
c: \(\left(-145\right)-\left(18-145\right)\)
\(=-145-18+145\)
\(=\left(-145+145\right)-18\)
=0-18
=-18
d: \(111+\left(-11+27\right)\)
\(=\left(111-11\right)+27\)
=100+27
=127
e: \(\left(27+514\right)-\left(486-73\right)\)
\(=27+514-486+73\)
\(=\left(27+73\right)+\left(514-486\right)\)
\(=100+28=128\)
f: \(\left(36+79\right)+\left(145-79-36\right)\)
\(=36+79+145-79-36\)
\(=\left(36-36\right)+\left(79-79\right)+145\)
=0+0+145
=145
A = 27 + 46 + 79 + 34 + 53
A = ﴾ 27 + 53 ﴿ + ﴾ 46 + 34 ﴿ + 79
A = 80 + 80 + 79
A = 160 + 79
A = 239
TK NHA
27 + 46 + 79 + 34 + 53
= ( 27 + 53 ) + ( 46 + 34 ) + 79
= 80 + 80 + 79
= 80 . 2 + 79
= 160 + 79
= 239
Vậy A = 239
-7264 + ( 1543 + 7264 )
=-7264 + 1543 + 7264
=1543
(144 - 97 ) -144
=144 - 97 - 144
=-97
( -145 ) - ( 18 -145 )
= -145 - 18 - 145
=-308
111 + ( -11 + 27 )
=111 - 11 + 27
=127
( 27+ 514 ) - (486-73)
=27 + 514 - 486 - 73
=-18
( 36 + 79 ) + ( 145 - 79 - 36 )
=36 + 79 + 145 - 79 - 36
=145
( 38 -29+ 43 ) - ( 43 + 38 )
=38 - 29 + 43 - 43 + 38
=47
271 - [ ( -43 ) + 271 - ( -17)]
= 271 + 43 + 271 + 17
=602
-144 - [ 29 - ( + 144 ) - ( + 144 ) ]
=-144 - 29 - 144 - 144
=-461
hok tốt !
a) -7264+(1543 +7264) b) (144-97)-144 c)(-145)-(18-145)
=(-7264)+1543+7264 =144-97-144 =(-145)-18+145
= [(-7264)+7264]+1543 =(144-144)-97 =[(-145)+145}-18
=0+1543 =0-97 = 0-18
=1543 = -97 = -18
1) - 7264 + ( 1543 + 7264 )
= ( - 7264 + 7264 ) + 1543
= 0 + 1543
= 1543
2) ( 144 - 97 ) - 144
= ( 144 - 144 ) - 97
= 0 - 97
= - 97
3) ( - 145 ) - ( 18 - 145 )
= ( - 145 + 145 ) - 18
= 0 - 18
= - 18
4) 111 - ( - 11 + 107 )
= ( 111 + 11 ) + 107
= 122 + 107
= 229
5) ( 27 + 514 ) - ( 486 - 73 )
= ( 27 + 73 ) + ( 514 - 486 )
= 100 + 28
= 128
6) ( 36 + 79 ) + ( 145 - 79 - 36 )
= ( 36 - 36 ) + ( 79 - 79 ) + 145
= 0 + 0 + 145
= 145
1) - 7264 + ( 1543 + 7264 )
= ( - 7264 + 7264 ) + 1543
= 0 + 1543
= 1543
2) ( 144 - 97 ) - 144
= ( 144 - 144 ) - 97
= 0 - 97
= - 97
3) ( - 145 ) - ( 18 - 145 )
= ( - 145 + 145 ) - 18
= 0 - 18
= - 18
4) 111 - ( - 11 + 107 )
= ( 111 + 11 ) + 107
= 122 + 107
= 229
5) ( 27 + 514 ) - ( 486 - 73 )
= ( 27 + 73 ) + ( 514 - 486 )
= 100 + 28
= 128
6) ( 36 + 79 ) + ( 145 - 79 - 36 )
= ( 36 - 36 ) + ( 79 - 79 ) + 145
= 0 + 0 + 145
= 145
Câu 1 : -123 + 77 + ( - 257 ) + 23 - 43
= ( -123 + 23 ) + ( -257 + 77 ) - 43
= -100 + ( -180 ) - 43
= -280 - 43
= -323
Câu 2 : ( 36 + 79 ) + ( 145 - 79 - 36 )
= 36 + 79 + 145 - 79 - 36
= ( 36 - 36 ) + ( 79 - 79 ) + 145
= 0 + 0 + 145
= 145
Câu 1 : ( -123) + 77 + (-257) + 23 - 43 =
= [ (-123) +23 ] + [ (-257) - 43 ) + 77
= (-100) + (-300) + 77
= (-400) + 77
= -323
Câu 2 : ( 36 + 79 ) + ( 145 - 79 - 36 ) =
= 36 + 79 + 145 - 79 - 36
= ( 36 - 36 ) + ( 79 - 79 ) + 145
= 0 + 0 + 145
= 145
Học tốt nhé###
khoảng cách : `3`
số số hạng là : `(79-1):1+1=79`
tổng là : `(79+1) . 79 : 2=3160`
a ) 159 − 524 − 59 − 424 ; = 159 − 524 − 59 + 424 = 159 − 59 − 524 − 424 = 100 − 100 = 0 b ) 36 + 79 + 145 − 79 − 36 ; = 36 + 79 + 145 − 79 − 36 = 36 − 36 + 79 − 79 + 145 = 145 c ) 334 − 117 + 234 + 42 + 117 ; = 334 − 117 − 234 + 42 + 117 = 334 − 234 − 117 − 117 + 42 = 100 + 42 = 142 d ) 271 − − 43 + 271 − − 17 . = 271 − − 43 + 271 + 17 = 271 + 43 − 271 − 17 = 271 − 271 + 43 − 17 = 26
= 79 x 46 -79x145 - 79
= 79 x ( 46 - 145 -1 )
= 79 x (-100)
= -7900
=(-79)\(\times\left(-46\right)+\left(-79\times145\right)+\left(-79\right)\times1\)
=(-79)\(\times\left(-46+145+1\right)\)
=\(\left(-79\right)\times100\)
=-7900