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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
=(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 :
\((-x+31)-39=-69+11\)
\((-x+31)-39=-58\)
\(-x+31=-58+39\)
\(-x+31=-19\)
\(-x=-19-31\)
\(-x=-50\)
\(=>x=50\)
a) ( 1267-196 ) - ( 267 + 304 )
= ( 1267 - 267 ) - ( 196 + 304 )
= 1000 - 400
= 600
b ) ( 3965 - 2378 ) - ( 437-1378 ) - 528
=
(3965-2378)-(437-1378)-528
=1587-(-941)-528
=1587+941-528
=2528-528
=2000
A) 57.39 + 43.39 - 57.11 - 43
= 57.(39 - 11) + 43.(39 - 1)
= 57.28 + 43.38
= 57.28 + 43.(28 + 10)
= 57.28 + 43.28 + 43.10
= 28.(57 + 43) + 430
= 28.100 + 430
= 2800 + 430
= 3230
B) 547 - 1378 - 2547 + 2378 + 117
= (2378 - 1378) - (2547 - 547) + 117
= 1000 - 1000 + 117
= 0 + 117
= 117
C) -462 + [(-814) + 462 + 314]
= -462 - 814 + 462 + 314
= (-462 + 462) - (814 - 314)
= 0 - 500
= -500
D) [461 + (-148) + 80] + (-461)
= 461 - 148 + 80 - 461
= (461 - 461) - (148 - 80)
= 0 - 68
= -68
E) 1152 - (-374 + 1152) + (-65 + 374)
= 1152 + 374 - 1152 - 65 + 374
= (1152 - 1152) + (374 + 374) - 65
= 0 + 748 - 65
= 683
(1267 - 196) - (267 - 204)
= 1267 - 196 - 267 + 204
= (1267 - 267) + (204 - 196)
= 1000 + 8
= 1008
(3965 - 2378) - (437 - 1378) - 528
= 3965 - 2378 - 437 + 1378 - 528
= 3965 - (437 + 528) - (2378 - 1378)
= 3965 - 965 - 1000
= 3000 - 1000
= 2000
2002 - 79 + 15 - (-79) - 15
= 2002 - (79 - 79) + (15 - 15)
= 2002 - 0 + 0
= 2002
-329 - (15 - 101) - (25 - 440)
= - 329 - 15 + 101 - 25 + 440
= (440 + 101 - 329) - (15 + 25)
= (541 - 329) - 40
= 212 - 40
= 172
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: \(\left(-329\right)-\left(15-101\right)-\left(25-440\right)\)
\(=-329-15+101-25+440\)
\(=\left(440-15-25\right)+\left(-329+101\right)\)
\(=400-228=172\)
a) 215+(-38)-(-58)+9-85
=215-38+58+9-85
=(215-38)+(58+9)-85
=177+67-85
=159
b)(1267-196)-(267-304)
=1071-(-37)
=1108
c)(3965-2378)-(437-1378)-528
=1578-(-941)-528
=2000.
Con d mk chiu.
a) 215 + (-38) - (-58) + 9-85
=215 - 38 + 58 + 9 - 85
=(215 - 38) + (58 + 9) - 85
=177 + 67 - 85
=159
b)(1267 - 196) - (267 - 304)
=1071 - (-37)
=1108
c)(3965 - 2378) - (437 - 1378) - 528
=1578 - (-941) - 528
=2000
(235 - 2378) - (396 - 2378)
= 235 - 2378 - 396 + 2378
= (235 - 396) - (2378 - 2378)
= - 161 - 0
= - 161
(235 - 2378) - (396 - 2378)
= 235 - 2378 - 396 + 2378
= (2378 - 2378) + (235 - 396)
= 0 + (-161)
= -161