(-404)+1002+(-2000)+1998+(-596)
126+(-20)+2004+(-106)
(-404)+1002+(-2000)+1998+(-596)
Tính giá trị biểu thức sau bằng cách hợp lí (thuận tiện)
a/(-596) + 1998 + (-2000) + (-404) + 1002
b/ 758 + [97 + ( - 758 ) + 903 ] + ( -1000 )
tính nhanh, tính hợp lí
a/ (-137)+254 +(-270)+(-463)+246
b/ (-596)+1998+1002+(-404)+197
a) (-137)+254+(-270)+(-463)+246
=[(-137)+(-463)]+(254+246)+(-270)
=(-600)+500+(-270)
=(-100)+(-270)
=-370
b)(-596)+1998+1002+(-404)+197
=[(-596)+(-404)]+(1998+1002)+197
=(-1000)+3000+197
=2000+197
==2197
Đúng thì tick nha
126 + ( - 20 ) + 2004 + ( - 106 ) = ?
Tính:
a) 126+(−20)+2004+(−106)126+(−20)+2004+(−106);
b) (−199)+(−200)+(−201)(−199)+(−200)+(−201).
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.
Tính: 126 + (-20) + 2004 + (-106)
126 + (–20) + 2004 + (–106)
= (126 – 20) + 2004 +(–106)
= 106 + 2004 + (–106)
= 106 + (–106) + 2004 (tính chất giao hoán).
= 0 + 2004
= 2004.
126+106+(-20)+2004
126+106+(-20)+2004
=[126+(-20)]+[106+2004]
=106+2110
=2216
126+(-20)+2004+(-106)
\(126+\left(-20\right)+2004+\left(-106\right)\)
\(=126-20+2004-106\)
\(=106+2004-106\)
\(=2110-106\)
\(=2004\)
a) 126 + (-20) + 2004 + (-106) = 106 + 2004 + (-106) = 106 + (-106) + 2004 = 0 + 2004 = 2004
126 + (-20) + 2004 + (-106)
= 126 + 2004 + (-20) + (-106)
= 2130 + (-20) + (-106)
= 2110 + (-106)
= 2004
tính hợp lý
126 + (- 20) + 2004 + (- 106)
=[126+(-106)]+(-20)+2004
=20+(-20)+2004
=0+2004
=2004
hok tốt!!
Trả lời:
\(126+\left(-20\right)+2004+\left(-106\right)\)
\(=\left(126-106\right)-20+2004\)
\(=20-20+2004\)
\(=0+2004\)
\(=2004\)
Hok tốt!
Vuong Dong Yet