Tính nhanh
a (3965-2378)-(437-1378)-528
b-(2003+80-91)-(515-80+91)
Bài 4:Bỏ dấu ngoặc rồi tính
a, (3965 - 2378) - (437 -1378) - 528
b, (-457) + (-123) + 23 + 237
c, (-329) - (15 - 101) - (25 - 440)
a: \(\left(3965-2378\right)-\left(437-1378\right)-528\)
\(=3965-2378-437+1378-528\)
\(=\left(3965-437-528\right)-\left(2378-1378\right)\)
\(=3000-1000=2000\)
b: \(\left(-457\right)+\left(-123\right)+23+237\)
\(=\left(-457+237\right)+\left(-123+23\right)\)
\(=-220-100=-320\)
c: \(\left(-329\right)-\left(15-101\right)-\left(25-440\right)\)
\(=-329-15+101-25+440\)
\(=\left(440-15-25\right)+\left(-329+101\right)\)
\(=400-228=172\)
Bài 1 Bỏ ngoặc rồi tính
b) (3965-2378-2378)-(437-1378)-528
Lời giải:
$=3965-2378-2378-437+1378-528$
$=3965-(2378-1378)-2378-437-528$
$=3965-1000-2378-437-528$
$=2965-(2378+437+528)=2965-3343=-378$
(3965-2378)-(437-1378)-528
(3965-2378)-(437-1378)-528
=1587-(-941)-528
=1587+941-528
=2528-528
=2000
Tính nhanh
(3965-2378)-(437-1378)-528
Tính
(-x+31)-39=-69+11
(3965-2378)-(437-1378)-528
=3965-2378-437-1378-528
=(3965-(437+528))-(2378-1378)
=3000-1000
=2000
Bài 1 :
\((3965-2378)-(437-1378)-528\)
\(=3965-2378-437+1378-528\)
\(=3965-(2378-1378)-(437+528)\)
\(=3965-1000-965\)
\(=(3965-965)-1000\)
\(=3000-1000\)
\(=2000\)
Bài 2 :
\((-x+31)-39=-69+11\)
\((-x+31)-39=-58\)
\(-x+31=-58+39\)
\(-x+31=-19\)
\(-x=-19-31\)
\(-x=-50\)
\(=>x=50\)
(-x+31)-39=-69+11
(-x+31)-39=-58
-x+31 =-58+39
-x+31 =-19
-x =-19-31
-x =-50
a) - ( 515 - 80 + 91 ) - ( 2003 + 80 - 91 )
\(-\left(515-80+91\right)-\left(2003+80-91\right)\)
\(=-\left(515-80+91\right)-2003-80+91\)
Ta đơn giản còn:
\(=-515-2003\)
\(=-2518\)
Theo cách của mk nghĩ thuj nka!!!^_^
a) - ( 515 - 80 + 91 ) - ( 2003 + 80 - 91 )
=-526-1992=-2518
k nha YoonA
Tính nhanh :
a) ( 1267 - 196 ) - ( 267 + 304 )
b) ( 3965 - 2378 ) - ( 437 - 1378 ) - 528
a) ( 1267-196 ) - ( 267 + 304 )
= ( 1267 - 267 ) - ( 196 + 304 )
= 1000 - 400
= 600
b ) ( 3965 - 2378 ) - ( 437-1378 ) - 528
=
a, (1267-196)-(267+304)
=(1267-267)-(196+304)
=1000-500
=500
b; (3965-2378)-(437-1378)-528
=(3965-528-437)-(2378-1378)
=3000-1000
=2000
Tính :
a , - (515 - 80 + 91) - (2003 + 80 - 91)
Giải chi tiết mình like luôn .
Tính :
a , - (515 - 80 + 91) - (2003 + 80 - 91)
Giải chi tiết mình like luôn .
Tính :
a , - (515 - 80 + 91) - (2003 + 80 - 91)
Giải chi tiết mình like luôn .
cách 1
- (515 - 80 + 91) - (2003 + 80 - 91)
= - ( 435 + 91 ) - ( 2083 - 91 )
= - 526 - 1992
= - 2518
- (515 - 80 + 91) - (2003 + 80 - 91)
= -515 + 80 - 91 - 2003 - 80 + 91
= -515 +( 80 - 80) + (90 - 90) -2003
= -515 + 0 + 0 -2003
= -2518
- (515 - 80 + 91) - (2003 + 80 - 91)
= -515 + 80 - 91 - 2003 - 80 + 91
= -515 +( 80 - 80) + (90 - 90) -2003
= -515 + 0 + 0 -2003
= -2518