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a: \(\left[504-\left(25\cdot8+70\right)\right]:9-15+19^0\)
\(=\left(504-270\right):9-15+1\)
\(=29-14\)
=15
a) [504 - (25 . 8 + 70)] : 9 - 15 + 190
[504 - (25 . 8 + 70)] : 9 - 15 + 1
[504 - (200 + 70)] : 9 - 15 + 1
(504 - 270) : 9 - 15 + 1
234 : 9 - 15 + 1
= 26 - 15 + 1
= 11 + 1
= 12
b) 5 . {26 - [3 . (5 + 2 . 5) + 15] : 15}
5 . {26 - [3 . (5 + 10) + 15] : 15}
5 . [26 - (3 . 15 + 15) : 15]
5 . [26 - (45 + 15) : 15]
5 . (26 - 60 : 15)
5 . (26 - 4)
= 5 . 22
= 110
a, [ 545 - ( 45 + 4 x 25 ) ] : 50 - 2000 : 250
[545 -( 45 + 100) ] : 50 - 2000 : 250
[ 545 - 145 ] : 50 - 2000 : 250
400 : 50 - 2000 : 250
8 - 8 = 0
b, [ 504 - ( 25 x 8 + 70 ) ] : 9 - 15 + 19
[ 504 - ( 200 + 70 ) ] : 9 - 15 + 19
[ 504 - 270 ] : 9 - 15 + 19
234 : 9 - 15 + 19
26 - 15 + 19 = 30
c, 5 x { 26 - [ 3 x ( 5 + 2 x 5 ) + 15 ] : 15 }
5 x { 26 -[ 3 x ( 5 + 10 ) + 15 ] : 15 }
5 x { 26 - [ 3 x 15 + 15 ] : 15 }
5 x { 26 - [ 45 + 15 ] : 15 }
5 x { 26 - 60 : 15 }
5 x { 26 - 4 }
5 x 22 = 110
a)[545-(45+4.25:50-2000:250+215:213
Đề bài sai
c) 5.{26-[3.(5+2.5)+15]:15}>
= 5.(26-(3.( 3.5 )+15):15)
= 5.(26-(3. 15 +15): 15)
= 5.(26-(3. 2. (15: 15)))
= 5.(26-(3. 2. 1 ))
= 5.(26- 6 )
= 5. 20
= 100 (máy tính của mik nó bị lỗi dấu ngoăc nhọn và ngoac vuông,mong bạn thông cảm)
a)[545-(45+4.25:50-2000:250+2\(^{15}\):2\(^{13}\) )
= [545- ( 45 + 100 : 50 - 2000 + \(2^2\))
= [545- ( 45 + 2 - 2000 + 4 )
= [ 545 - ( 47 - 2000 + 4 )
= [ 545 - ( -1935 + 4 )
= 545 - - 1949
= 2994
c) 5.{26-[3.(5+2.5)+15]:15}
5 . { 26 - [ 3 . ( 5 + 10 ) + 15 ] : 15 }
= 5 . { 26 - [ 3 . 15 + 15 ] : 15 }
= 5 . { 26 - [ 45 + 15 ] : 15 }
= 5 . { 26 - 60 : 15 }
= 5 . { -34 : 15 ]
= 5 . \(\frac{-34}{15}\)
= \(\frac{-34}{3}\)
2.17.9+18.540+29.18
=18.17+18.540+29.18
=18(17+540+18)
=18.575
(đề sai hay sao hả)
Bài 1 :
a) 1440 : [ 41 - (2x - 5)] = 24.3
=> 1440 : [41 - (2x - 5)] = 16.3
=> 1440 : [41 - (2x - 5)] = 48
=> 41 - (2x - 5) = 1440 : 48 = 30
=> 2x - 5 = 11
=> 2x = 16
=> x = 8
b) 5 . [225 - (x - 10)] - 125 = 0
=> 5 . [225 - (x - 10)] = 125
=> 225 - (x - 10) = 125 : 5
=> 225 - (x - 10) = 25
=> x - 10 = 200
=> x = 210
Bài 2 :
a) [ 545 - (45 + 4.25)] : 50 - 200 : 250 + 215 : 213
= [ 545 - (45 + 100)] : 50 - 4/5 + 22
= [545 - 145] : 50 - 4/5 + 4
= 400 : 50 - 4/5 + 4 = 8 - 4/5 + 4 =56/5
Mấy câu còn lại tương tự
Bài 1.
a, 1440:[41-(2x-5)]=24.3
1440:[41-(2x-5)]= 16.3
1440:[41-(2x-5)]=48
[41-(2x-5)] =1440:48
[41-(2x-5)] = 30
2x-5 = 41-30
2x-5 =11
2x = 11+5
2x = 16
x = 16:2
x =8
b, 5.[225-(x-10)]-125=0
5.[225-(x-10)] =125
[225-(x-10)] =125:5
[225-(x-10)] = 25
(x-10) = 225-25
(x-10) = 200
x =200+10
x = 210
Bài 2.
a, [545-(45+4.25)]:50-200:250+215:213
= [545-(45+100)]:50-200:250+22
= [545-145]:50- 200:250+4
= 400:50-200:250+4
= 8-0,8+4
= 7,2 + 4
= 11,4
b, [504-(25.8+70)]:9-15+190
= [504-(200+70)]:9-15+1
= [504-270]:9-16
= 234:9-16
= 26-16
= 10
c, 5.{26-[3.(5+2.5)+15]:15}
= 5.{26-[3.(5+10)+15]:15}
= 5.{26-[3.15+15]:15}
= 5.{26-[45+15]:15}
= 5.{26-60:15}
= 5.{26-4}
=5.22
= 110
d,[1104-(25.8+40)]:9+316:312
= [1104-(200+40)]:9+34
=[1104-240]:9+34
=864:9+81
=96+81
=177
hok tốt
Lời giải:
a.
$=5^{6-3}+2^{3-2}=5^3+2^1=125+2=127$
b.
$=3333:3+225:15=1111+15=1126$
c.
$=15.2^3+4.3^2-5.7=15.8+4.9-35=120+36-35=120+1=121$
d.
$=5.4^2-18:3^2=5.16-18:9=80-2=78$
e.
$=6^2:4.3+2.5^3=36:4.3+2.125$
$=9.3+250=27+250=277$
f.
$=80-(4.25-3.8)=80-(100-24)=80-100+24=-20+24=4$
13/ => 10 + 2x = 42 = 16
=> 2x = 6
=> x = 3
14/ => 52x : 53 - 50 = 75
=> 52x : 53 = 125 = 53
=> 52x = 56
=> 2x = 6
=> x = 3
15/ => (26 - 3x) : 5 = 4
=> 26 - 3x = 20
=> 3x = 6
=> x = 2
16/ => x - 17 = -25
=> x = -8
= 5.{26-[3.15+15]:15}
= 5.{26-[45+15]:15}
= 5.{26-60:15}
= 5.{26-4}
= 5.22
= 110
5. { 26 - [ 3 . ( 5 + 2.5) + 15 ] : 15 }
= 5. { 26 - [ 3 . ( 5 + 10 ) + 15 ] : 15 }
= 5. { 26 - [ 3 . 15 + 15 ] : 15 }
= 5. { 26 - [ 45 + 15 ] : 15 }
= 5. { 26 - 60 : 15 }
= 5. { 26 - 4 }
= 5 x 22 = 110
Hok tốt !