Toán Lớp 6: Bỏ ngoặc rồi tính
a) 123 +[ 54 + (-123) +46 ]
b) -64 + [( -111) + 64 +71 ]
c) ( 123 +27 ) + ( 27 + 13 – 123 )
d) ( 175 + 27 +13 ) – ( -15 + 175 + 25 )
e) ( 2012 – 199 + 29 ) – ( -199 + 29 )
f) – ( 55 – 80 + 91 ) – ( 2012 + 80 – 91 )
g) [ 128 + (-78) + 100 ] – ( 128 )
h) 125 + [(-100) + 93] + (-218)
l) [ 453 + 74 + (-79 )] + ( 527 )
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=123+[54-123+46]
=123+54-123+46
=(123-123)+(54+46)
=0+100
=100
=(-64)-111+64+71
=(64-64)+[(-111)+71]
=0-40
=-40
=123+27+27+13-123
=(123-123)+(27+13)+27
=0+40+27
=67
=175+27+13+15-175-25
=(175-175)+(27+13)+(15-25)
=0+40-10
=30
=2012-199+29+199-29
=(199-199)+(29-29)+2012
=0+0+2012
=2012
=(-55)+80-91-2012-80+91
=(91-91)+(80-80)+[(-55)-2012]
=0+0-2067
=-2067
=[128-78+100]-128
=128-78+100-128
=(128-128)+(100-78)
=0+22
=22
=125-100+93-218
=(125-218+93)-100
=0-100
=-100
=453+74-79+527
=(74-79)+(453+527)
=(-5)+980
=975