Tính: 126 + (-20) + 2004 + (-106)
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a) 126+(−20)+2004+(−106)126+(−20)+2004+(−106)
=2004+126+[(−20)+(−106)]=2004+126+[(−20)+(−106)]
=2004+126+[−(20+106)]=2004+126+[−(20+106)]
=2004+126+(−126)=2004+126+(−126)
=2004+[126+(−126)]=2004+0=2004=2004+[126+(−126)]=2004+0=2004.
b) (−199)+(−200)+(−201)=−(199+200+201)(−199)+(−200)+(−201)=−(199+200+201)
=−(199+201+200)=−[(199+201)+200]=−(199+201+200)=−[(199+201)+200]
=−(400+200)=−600=−(400+200)=−600.
=[126+(-106)]+(-20)+2004
=20+(-20)+2004
=0+2004
=2004
hok tốt!!
126+106+(-20)+2004
=[126+(-20)]+[106+2004]
=106+2110
=2216
\(126+\left(-20\right)+2004+\left(-106\right)\)
\(=126-20+2004-106\)
\(=106+2004-106\)
\(=2110-106\)
\(=2004\)
a) 126 + (-20) + 2004 + (-106) = 106 + 2004 + (-106) = 106 + (-106) + 2004 = 0 + 2004 = 2004
(-404)+1002+(-2000)+1998+(-596)
=[1002+1998+(-2000)]+[(-404)+(-596)]
= 0+0=0
a) 126 + (-20) + 2004 + (-106)
= 106 + 1898
= 2004
b) (-199) + (-200) + (-201)
= (-399) + (-201)
= -600
a: \(\left(2345+45\right)-2345\)
\(=2345+45-2345\)
\(=45+\left(2345-2345\right)\)
=45+0
=45
b: \(\left(-2010\right)-\left(119-2010\right)\)
\(=-2010-119+2010\)
\(=\left(-2010+2010\right)-119\)
=0-119
=-119
c: \(\left(18+29\right)+\left(158-18-29\right)\)
\(=18+29+158-18-29\)
\(=158+\left(18-18\right)+\left(29-29\right)\)
=158+0+0
=158
d: \(126+\left(-20\right)+2004+\left(-106\right)\)
\(=126-20+2004-106\)
\(=\left(126-20-106\right)+2004\)
=0+2004
=2004
e: \(\left(-199\right)+\left(-200\right)+\left(201\right)\)
\(=-199-200+201\)
\(=-199+\left(201-200\right)\)
=-199+1
=-198
f: \(99+\left(-100\right)+101\)
\(=\left(99+101\right)-100\)
=200-100
=100
g: \(217+\left[43+\left(-217\right)+\left(-23\right)\right]\)
\(=217+43-217-23\)
\(=\left(217-217\right)+\left(43-23\right)\)
=0+20
=20
126 + (–20) + 2004 + (–106)
= (126 – 20) + 2004 +(–106)
= 106 + 2004 + (–106)
= 106 + (–106) + 2004 (tính chất giao hoán).
= 0 + 2004
= 2004.