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101-102-(-103)-104-(-105)-106-(-107)-108-(-109)-110
=101-102+103-104+105-106+107-108+109-110
=(101-102)+(103-104)+(105-106)+(107+108)+(109+110)
= ( -1) + (-1) + (-1) + (-1) + (-1)
= (-1)x5
= -5
Từ đầu bài =) (101+103+105+107+109)-(102+104+106+108)
= [(101+109)+(103+107)+105]-[(102+108)+(104+106)]
= 210+210+105-210-210
= 0+105
= 105
101-102-(-103)-104-(-105)-106-(-107)-108-(-109)
= 101-102+103-104+105-106+107-108+109
= (101+109) - (102 +108) +(103+107)-(104+106) +105
= 210-210+210-210 +105
=105
=101-102+103-104+105-106+107-108+109-110
=(101-102)+(103-104)+(105-106)+(107-108)+(109-110)
=(-1)+(-1)+(-1)+(-1)+(-1)
=-5
101 - 102 - ( - 103 ) - 104 - ( - 105 ) - 106 - ( - 107 ) - 108 - ( - 109 ) - 110
= 101 - 102 + 103 - 104 + 105 - 106 + 107 - 108 + 109 - 110
= 101 + 109 - 102 - 108 + 103 + 107 - 104 - 106 + 105 - 110
= ( 101 + 109 ) - ( 102 + 108 ) + ( 103 + 107 ) - ( 104 106 ) + ( 105 - 110 )
= 210 - 210 + 210 - 210 + ( - 5 )
= 0 + ( - 5 )
= -5
\(\text{101-102-(-103)-104-(-105)-106-(-107)-108-(-109)-110 }\)
\(=101-102+103-104+105-106+107-108+109-110\)
\(=\left(-1\right)+103-104+105-106+107-108+109-110\)
\(=102-104+105-106+107-108+109-110\)
\(=\left(-2\right)+105-106+107-108+109-110\)
\(=103-106+107-108+109-110\)
\(=\left(-3\right)+107-108+109-110\)
\(=104-108+109-110\)
\(=\left(-4\right)+109-110\)
\(=105-110\)
\(=-5\)
Hok tốt!
@Kaito Kid
Bài làm
a) 11 - 12 + 13 - 14 + 15 - 16 + 17 - 18 + 19 - 20
= ( 11 - 12 ) + ( 13 - 14 ) + ( 15 - 16 ) + ( 17 - 18 ) + ( 19 - 20 )
= ( -1 ) + ( -1 ) + ( -1 ) + ( -1 ) + ( -1 )
= -5
b) 101 - 102 - ( - 103 ) - 104 - ( - 105 ) - 106 - ( - 107 ) - 108 - ( - 109 ) - 110
= 101 - 102 + 103 - 104 + 105 - 106 + 107 - 108 + 109 - 110
= ( 101 - 102 ) + ( 103 - 104 ) + ( 105 - 106 ) + ( 107 - 108 ) + ( 109 - 110 )
= ( -1 ) + ( -1 ) + ( -1 ) + ( -1 ) + ( -1 )
= -5
# Học tốt #
a)11 - 12 + 13 - 14 + 15 - 16 + 17 - 18 + 19 - 20
= (11 - 12) + (13 - 14) + (15 - 16) + (17 - 18) + ( 19 - 20)
= (-1) + (-1) + (-1) + (-1) + (-1) = (-1) . 5 = - 5
b)101-102-(-103)-104-(-105)-106-(-107)-108-(-109)-110
= 101-102+103-104+105-106+107-108+109-110
= (101-102)+(103-104)+(105-106)+(107-108)+(109-110)
= (-1) + (-1) + (-1) + (-1) + (-1)
= (-1) . 5
= -5
a/ 234 - 117 + (-100) + (-234) = 234 + (-234) - 117 + (-100) = -217
b/ -927 + 1421 + 939 + (-1421) = 1421 + (-1421) - 927 + 939 = 12
c/ 11 - 12 + 13 - 14 + 15 -16 + 17 - 18 + 19 - 20
= (-1) + (-1) + (-1) + (-1) + (-1) = -5
d/ 101 - 102 - (-103) - 104 - (-105) - 106 - (-107) - 108 - (-109) -110
= (101 - 102) - [( -103) + 104] - [ (-105) + 106] - [(-107) + 108] - [(-109) + 110]
= (-1) - 1 - 1 - 1 - 1 = -5
=101-102-103+104-105-106+107-108+109+110
= (101+104+107+109+110)-(102+103+105+106+108)
=701-704
=-3
ý lộn
= 531-524
=-7