Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
100:{250:[450-(4 . 53-22 . 25 ] }
=100:{250:[450-(500-100)])
=100:{250:[450-400])
=100:{250:50}
=100:5
=20
13 - 2(x + 1) = 7
=> 2(x + 1) = 13 - 7 = 6
=> (x + 1) = 6 : 2 = 3
=> x = 2
6x + 23 = 52. 2
=> 6x + 8 = 25. 2
=> 6x + 8 = 50
=> 6x = 50 - 8 = 42
=> x = 7
x + 2 . x + 3x + .... + 9x = 450
x.(1+ 2 + 3 + ... + 9) = 450
x. 45 = 450
=> x = 450 : 45 = 10
1) 13-2(x+1)=7
<=>2(x+1)=6
<=>x+1=3
<=>x=2
2) 6x+23=52.2
<=>6x=42
<=>x=7
3) 420+56.4=(x+175):5+30
<=>644-30=(x+175):5
<=>614x5=x+175
<=>3070-175=x
<=>x=2895
4) x+2x+3x+...+9x=450
<=>x(1+2+3+...+9)=450
<=>45x=450
<=>x=10
a, 32 . 5 - 2x . 6 + 183
= 9 . 5 - 2x . 6 + 1
= 45 - 2x . 6 + 1
= 45 - 2x + 1 . 3 + 1
= 3( 15 - 2x + 1) + 1
b, 100 : { 280 : [ 450 - ( 480 - 4 . 52 ) ] }
= 100 : { 280 : [ 450 - 380 ] }
= 100 : { 280 : 70 }
= 100 : 4 = 25
c, 8 . { 24 - [ 3 . ( 5 + 25 ) + 15 ] : 15 }
= 8 . { 24 - [ 3 . 30 + 15 ] : 15 }
= 8 . { 24 - 105 : 15 }
= 8 . { 24 - 7 }
= 8 . 17 = 136
\(100\div\left\{250\div\left[450-\left(4\times5^2-2^2\times25\right)\right]\right\}\)
\(=100\div\left\{250\div\left[450-\left(4\times25-4\times25\right)\right]\right\}\)
\(=100\div\left\{250\div\left[450-0\right]\right\}\)
\(=100\div\frac{250}{450}=100\times\frac{450}{250}=180\)
\(3^3.18-3^3.12=3^3.2.3^2-3^3.2^2.3=3^5.2-3^4.2^2=3^4.2.\left(3-2\right)=3^4.2=162\\ \)
a) A= (\(2^9.3+2^9.5\)) : \(2^{12}\)
= \(2^9\)(3+5) : \(2^{12}\)
= \(2^9.8:2^{12}\)
= \(2^9.2^3:2^{12}\)
= \(2^{12}:2^{12}\)
=1
1) 100 : { 250 : [ 450 - ( 4 x 53 - 22 x 25 ) ] }
= 100 : { 250 : [ 450 - ( 4 x 125 - 4 x 25 ) ] }
= 100 : { 250 : [ 450 - ( 500 - 100 ) ] }
= 100 : [ 250 : ( 450 - 400 ) ]
= 100 : ( 250 : 50 )
= 100 : 5
= 20
2) 30 : { 175 : [ 355 - ( 135 + 37 x 5 ) ] }
= 30 : { 175 : [ 355 - ( 135 + 185 ) ] }
= 30 : [ 175 : ( 355 - 320 ) ]
= 30 : ( 175 : 35 )
= 30 : 5
= 6
chúc bạn học giỏi
1) 100 : { 250 : [ 450 - ( 4 x 53 - 22 x 25 ) ] }
= 100 : { 250 : [ 450 - ( 4 x 125 - 4 x 25 ) ] }
= 100 : { 250 : [ 450 - ( 500 - 100 ) ] }
= 100 : [ 250 : ( 450 - 400 ) ]
= 100 : ( 250 : 50 )
= 100 : 5
= 20
2) 30 : { 175 : [ 355 - ( 135 + 37 x 5 ) ] }
= 30 : { 175 : [ 355 - ( 135 + 185 ) ] }
= 30 : [ 175 : ( 355 - 320 ) ]
= 30 : ( 175 : 35 )
= 30 : 5
= 6
tìm x
a) 7(x-4)3+30=219
7(x-4)3=219-30
7(x-4)3=189
(x-4)3=189:7
(x-4)3=27
(x-4)3=33
x-4=3
x=3+4
x=7
b,720:[41(2.x-5)]=40
41(2.x-5)=720:40
41(2.x-5)=18
2.x-5=18:41
2.x-5=\(\frac{18}{41}\)
2.x=\(\frac{18}{41}\)+5
2.x=\(\frac{223}{41}\)
x=\(\frac{223}{41}\):2
x=\(\frac{223}{82}\)
Tính
c)100:{250:[450-(4.53-22.25]}
=100:{250:[450-(4.125-4.25]}
=100:{250:[450-[500-100]}
=100:{250:[450-400]}
=100:{250:50}]
=100:50
=2
(li-ke cho mình nha)
a) \(4.5^2-81:3^2=4.25-81:9=100-9=91\)
b) \(3^3.23-3^3.19=3^3.\left(23-19\right)=27.4=108\)
c) \(2^4.5-[131-\left(13-4\right)^2]=16.5-\left(131-9^2\right)=80-\left(131-81\right)=80-50=30\)
d) \(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-4.\left(125-25\right)\right]\right\}\)
\(=100:\left[250:\left(450-4.100\right)\right]\)
\(=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)
420 ; {350 : [450 - (4 . 53 - 22 . 25)]} = 420 : [350 : 450 ( 4 . 125 - 4 . 25 )]
= 420 : [350 : 450 - (500 - 100) = 420 : [350 : (450 - 400)]
= 420 : (350 : 50) = 420 : 7 = 60
420:{350:[450-(4.5^3-2^2.25)]}
=420:{350:[450-(4.125-4.25)]}
=420:{350:[450-400]
=420:{350:50}
=420:7
=60