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a) \(232-\left(581+132-331\right)\)
\(=232-581-132+331\)
\(=\left(232-132\right)+\left(331-581\right)\)
\(=100-250\)
\(=-150\)
b) \(\left[12+\left(-57\right)\right]-\left[-57-\left(-12\right)\right]\)
\(=12-57+57-12\)
\(=\left(12-12\right)+\left(57-57\right)\)
\(=0+0\)
\(=0\)
a) 232 - ( 581 + 132 - 331 )
= 232 - 581 - 132 + 331
= ( 232 - 132 ) - ( 581 - 331 )
= 100 - 250
= -150
a: \(232-\left(581+132-331\right)\)
\(=232-581-132+331\)
\(=\left(232-132\right)+\left(-581+331\right)\)
\(=100-250\)
=-150
b: \(\left[12+\left(-57\right)\right]-\left[-57-\left(-12\right)\right]\)
\(=12+\left(-57\right)+57+\left(-12\right)\)
\(=\left(12-12\right)+\left(57-57\right)\)
=0+0
=0
a) 232 - (581 + 132 - 331)
= 232 - 581 - 132 + 331
= (232 - 132) - (581 - 331)
= 100 - 250
= -(250 - 100)
= -150
b) [12 + (-57)] - [-57 - (-12)]
= 12 - 57 + 57 - 12
= (12 - 12) + (57 - 57)
= 0 + 0
= 0
a, -321 + (-29 ) - 142 - (-72) = -321 - 29 - 142 + 72 = -420.
b, 214 - (-36) + (-305) = 214 + 36 - 305 = -55.
c, 232 - (581 + 132 - 331) = 232 - 581 - 132 + 331 = -150.
d, [ 12+ (-57)] - [-57 - (-12) = 12 - 57 + 57 - 12 = 0.
a. 57 + 58 + 59 + 60 + 61 - 17- 18 - 19 - 20 - 21
= (57 - 17) + (58 - 18) + (59 - 19) + (60 - 20) + (61 - 21)
= 40 + 40 + 40 + 40 + 40
= 40 . 5
= 200
b. 9 - 10 + 11 - 12 + 13 - 14 + 15 - 16
= ( 9 - 10 ) + ( 11 - 12 ) + ( 13 - 14 ) + ( 15 - 16 )
= -1 + (-1) + (-1) + (-1)
= (-1) . 4
= -4
a, ( - 2 ) + 7 + ( - 12 ) + 17 + ... + ( - 52 ) + 57
= [ ( - 2 ) + 7 ] + [ ( - 12 ) + 17 ] + ... + [ ( - 52 ) + 57 ]
= 5 + 5 + ... + 5
= 5 .6 = 30
b, ( - 30 ) + ( - 29 ) + ... + 48 + 49 + 50
= [ ( - 30 ) + 30 ) ] + [ ( - 29 ) + 29 ] + ... + 0 + 31 + 32 + 33 + 34 + .. + 48 + 49 + 50
= 0 + 31 + 32 + 33 + .. + 48 + 49 + 50
= 810
a) (-2) + 7 + (-12) + 17 + ... + (-52) + 57
= (-2 + 7) + (-12 + 17) + ... + (-52 + 57)
= 5 + 5 + ... + 5 (6 chữ số 5)
= 30
b) (-30) + (-29) + (-28) + ... + 49 + 50
= 31 + 32 + ... + 49 + 50
= (50 + 31) . (50 - 31 + 1) : 2
= 81 . 10
= 810
`a, 232 - ( 581 + 132 -331)`
`= 232 - 581 - 132 +331`
`= (232-132) +(-581 + 331)`
`= 100 -250`
`=-150`
`b, [12+ (-57)] - [-57-(-12)]`
`= 12+ (-57) - (-57+12)`
`= 12+ (-57) + 57 -12`
`= (12-12) + (-57+57)`
`= 0+0`
`=0`
`a)232-(581+132-331)`
`=232-581-132+331`
`=(232-132)-(581-331)`
`=100-250`
`=-150`
`b)[12+(-57)]-[-57-(-12)]`
`=(12-57)-(-57+12)`
`=12-57+57-12`
`=(12-12)-(57-57)`
`=0-0`
`=0`