Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)
=36-79+150+79-36
=36-36-79+79+150
=150
b)
=27-514-486+73
=27+73-514-486
=-900
c)
=35-42+14-35-58+86
=35-35-42-58+14+86
=0
d)
=125-153+87-125+13-47
=125-125-153-47+87+13
=-100
e)
=1267-196-267-304
=1267-267-196-304
=500
g)
=1152-374-1152-65+374
=1152-1152-374+374-65
=-65
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
e) \(1+2+3+...+200\)
\(=\frac{\left(200+1\right).\left[\left(200-1\right)+1\right]}{2}\)
\(=20100\)
\(a)79+243+21\)
\(=\left(79+21\right)+243\)
\(=100+243\)
\(=343\)
A = 78 x 31 + 78 x 24 + 78 x 17 + 22 x 72
A = 78 x ( 31 + 24 + 17 ) + 22 x 72
A = 78 x 72 + 22 x 72
A = 72 x ( 78 + 22 )
A = 72 x 100
A = 7200
C = 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
C = 39 x ( 53 + 47 ) - 21 x ( 53 - 47 )
C = 39 x 100 - 21 x 6
C = 3900 - 126
C = 3774
a.125-(27-75+73)
= 125 - (27 + 73 - 75)
= 125 - (100 - 75)
=125 - 25
=100
b.314-(21-86+79)
= 314 - (21 + 79 - 86)
= 314 - (100 - 86)
= 314 - 14
= 300
c.728-(211-72+89)
= 728 - (211 + 89 -72)
= 728 - (300 - 72)
= 728 - 28
= 700
d.(547-623)-(547-23)
= 547 - 623 - 547 + 23
= 547 - 547 + 23 - 623
= 0 + -600
= - 600
a)125-(27-75+73)=125-27+75-73=(125+75)-(27+73)=200-100=100. b)314-(21-86+79)=314-21+86-79=(314+86)-(21+79)=400-100=300. c) 728-(221-72+89)=(728+72)-(221+89)=800-300=500. d) (547-623)-(547-23)=547-623-547+23=(547-547)+(23-623)=0+(-600)=-600