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Bài 1:
a, (-33) + 45 + (-67)
= - (33 + 67) + 45
= - 100 + 45
= - 55
c, 75 : [ (153 - 6.52).8 + 20110 ]
= 75 : [ 153 - 312].8 + 1]
= 75 : [ - 159.8 + 1]
= 75 : [-1272 + 1]
= 75 : (-1271)
= - \(\dfrac{75}{1271}\)
Bài 2
6\(x\) + 15 = 75
6\(x\) = 75 - 15
6\(x\) = 60
\(x\) = 60 : 6
\(x\) = 10
1) \(-452-\left(-67+75-452\right)\)
\(=-452+67-75+452\)
\(=-\left(452-67\right)-75+452\)
\(=-385-75+452\)
\(=-\left(385+75\right)+452\)
\(=-460+452\)
\(=-\left(460-452\right)\)
\(=-8\)
b) \(35-\left\{12-\left[-14+\left(-2\right)\right]\right\}\)
\(=35-\left[12-\left(-14-2\right)\right]\)
\(=35-\left\{12-\left[-\left(14+2\right)\right]\right\}\)
\(=35-\left[12-\left(-16\right)\right]\)
\(=35-\left(12+16\right)\)
\(=35-28\)
\(=7\)
c) \(-\left|-5\right|+\left(-19\right)+18+\left|11-4\right|-57\)
\(=-5-19+18+\left|7\right|-57\)
\(=-5-19+18+7-57\)
\(=-\left(5+19\right)+18+7-57\)
\(=-24+18+7-57\)
\(=-\left(24-18\right)+7-57\)
\(=-6+7-57\)
\(=-\left(6-7\right)-57\)
\(=-\left(-1\right)-57\)
\(=1-57\)
\(=-57+1\)
\(=-\left(57-1\right)\)
\(=-56\)
Mình đặt tên a,b,c cho 3 ý cho dễ gọi nha.
a,\(-452-\left(-67+75-452\right)\)
\(=-452+67-75+452\)
\(=-8\)
b,\(35-\left\{12-\left[-14+\left(-2\right)\right]\right\}\)
\(=35-\left(12+14-2\right)\)
\(=35-24\)
\(=11\)
c,\(-\left|-5\right|+\left(-19\right)+18+\left|11-4\right|-57\)
\(=-5-19+18+7-57\)
\(=-56\)
a) x+ 45 - [90+(-20)+5-(-45)]+3x
= x + 45 - [70+50]+3x
= x + 45 - 120 + 3 x
= ( x + 3x) + (45-120)
= 4x + (-75)
b) x+(294+13)+(94-13)+9x
= ( x + 9x ) + (294+13)+(94-13)
= 10x + 307+81
= 10x + 388
Trả lời:
a) x + 45 - [90 + (-20) + 5 - (-45)] + 3x
= (x + 3x) + 45 - (75 + 45)
= 4x + 45 - 75 - 45
= 4x + (45 - 45) - 75
= 4x + 0 - 75
= 4x - 75
b) x + (294 + 13) + (94 - 13) + 9x
= (9x + x) + 294 + 13 + 94 - 13
= 10x + (294 + 94) + (13 - 13)
= 10x + 388 + 0
= 10x + 388
Banh Bao Tong
a) (-33) + 45 + (-67)
= - (33 + 67) + 45
= -100 + 45
= -55
b) 28.69 + 28.31 + (-100)
= 28.(69 + 31) + (-100)
= 28.100 + (-100)
= 2800 + (-100)
= 2700
c) 75 : [(153 - 6.52).8 + 20110]
= 75 : [(153 - 6.25).8 + 1]
= 75 : [(153 - 150). 8 + 1]
= 75 : [3.8 +1]
= 75 : [24 + 1]
= 75 : 25
= 3
45.(57-55)+55.(45+57)
=45.2+55.102
=90+5610
=5700
Hok tốt^^
37 . 75 + 37 . 45 + 63 . 67 + 63 . 53
= ( 75 + 45 ) . 37 + ( 67 + 53 ) . 63
= 120 . 37 + 120 . 63
= 120 . ( 37 + 63 )
= 120 . 100
= 12000
37.75+37.45+63.67+63.53
=37(75+45)+63(67+53)
=37.120+63.120
=(37+63)120
=100.120
=12000
tk nha phamthiminhtrang
a. (x+74)-318=200
=>x+74=200+318
x+74=518
x =518-74
x =444
b. 3636:(12.x-91)=36
=> 12.x-91=3636:36
12.x-91=101
12.x =101+91
12.x =192
x =192:12
x =16
c. (x:23+45).67=8911
=>x:23+45=8911:67
x:23+45=133
x:23 =133-45
x:23 =88
x =88.23
x =2024
318-74=244
200+318=518
mình chỉ biết giải đến đấy thôi đừng giận mình nhé
- 45 - ( 8) = -45 - 8 = -53
-45 - (-67 + 75)
= -45 + 67 + 75
= (-45 + 75) + 67
= 30 + 67
= 97