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234-117+ (-100)+(-234)
= (234-234)+ (-117-100)
= 0+ (-217)
= -217
\(234+\left(-117\right)+\left(-100\right)+\left(-234\right)\)
\(=117+\left(-100\right)+\left(-234\right)\)
\(=17+\left(-234\right)\)
\(=-217\)
234-117+(-100)+(-234)
=234+(-117)+(-100)+(-234)
=[234+(-234]+(-100)+(-117)
=0+(-100)+(-117)
=-217
(-927)+1421+930+(-1421)
=[(-1421)+1421]+[(-927)+930]
=0+3
=3
a) 234-117+(-100)+(-234)
=234+(-234)-117+(-100)
=0-117-100
=(-117)-100
=-217
Câu 2: a) 234-117+(-100)+(-234)=[234+(-234)]-117-100=0-117-100=-217
b) -927+1421+930+(-1421)=-927+930+[1421+(-1421)]=-927+930+0=3
Bài 1:
s1=1+(-3)+5+(-7)+............+17
s2=-2+4+(-6)+8+...........+(-18)
\(\Rightarrow\) s1 + s2 = (1-2-3+4)+(5-6-7+8)+...+(13-14-15+16)+17-18
= 0 + 0 + ...+ 0 + (-1)
= -1
Bài 2.
a) 234-117+(-100)+(-234)
= (-234 + 234 ) + [- 117 + (-100)]
= 0 + (-217)
= -217
b) -927+1421+930+(-1421)
= ( -1421 + 1421 ) + ( -927 + 930 )
= 0 + 3
= 3
a: \(\left(24-234\right)+\left(234-24-77\right)\)
\(=24-234+234-24-77\)
\(=\left(24-24\right)+\left(234-234\right)-77\)
=0+0-77
=-77
b: \(\left(13-135+49\right)-\left(13+49\right)\)
\(=13-135+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-135\)
=0+0-135
=-135
c: \(159-524-\left(59-424\right)\)
\(=159-524-59+424\)
\(=\left(159-59\right)-\left(524-424\right)\)
=100-100
=0
d: \(\left(36+79\right)+\left(145-79-36\right)\)
\(=36+79+145-79-36\)
\(=\left(36-36\right)+\left(79-79\right)+145\)
=0+0+145
=145
e: \(334-\left(117+234\right)+\left(42+117\right)\)
\(=334-117-234+42+117\)
\(=\left(334-234\right)+\left(117-117\right)+42\)
=100+0+42
=142
f: \(271-\left[\left(-43\right)+271-\left(-17\right)\right]\)
\(=271+43-271+\left(-17\right)\)
\(=\left(271-271\right)+\left(43-17\right)\)
=0+26
=26
\(234-117+\left(-100\right)+\left(-234\right)\)
\(=234-117-100-234\)
\(=\left(234-234\right)-\left(117+100\right)\)
\(=0-217\)
\(=-217\)
[117+ (-100)] - [234 - (-234)]
= 17 - 0
= 14