600:[450:{450-(4.53-23.52)}]
Thực hiện phép tính:
a, 600 : { 450 : 450 - 4 . 5 3 - 2 3 . 5 2 }
b, 18 . { 420 : 6 - 150 - ( 68 . 2 - 2 3 . 5 ) }
a, 600 : { 450 : 450 - 4 . 5 3 - 2 3 . 5 2 }
= 600:{450:[450 - (4.125 - 8.25)]} = 600:{450:[450 - (500 - 200)]}
= 600:{450:[450 - 300]} = 600:{450:150} = 600:3 = 200
b, 18 . { 420 : 6 - 150 - ( 68 . 2 - 2 3 . 5 ) }
= 18.{70 - [150 - (68.2 - 8.5)]} = 18.{70 - [150 - (136 - 40)]}
= 18.{70 - [150 - 96]} = 18.{70 - 54} = 18.16 = 288
100 : { 250 :[450- (4.53-22.25)]}
Nhanh giúp mik nha
\(100:\left\{250:\left[450-\left(4\cdot5^3-2^2\cdot25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(4\cdot125-4\cdot25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)
\(=100:\left[250:\left(450-400\right)\right]\)
\(=100:\left(250:50\right)\)
\(=100:5\)
\(=20\)
Thực hiện phép tính:
a)23.15 - [115-(12-5)2 ]
b) 100 : {250 : [450 - (4.53 - 23.25)]}
\(2^3.15-\left[115-\left(12-5\right)^2\right]=8.15-\left[115-7^2\right]=120-\left[115-49\right]=120-66=54\)
\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}=100:\left\{250:\left[450-\left(4.125-4.25\right)\right]\right\}=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)
\(=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)
a,23 . 15 -[115-\((\)12-5)2]
= 8. 15 - [115- 72 ]
=120-[115-49]
=120-66
=54
b, 100:{250:[450-\((\)4.53 - 23.25)]}
=100:{250:[450-\((\)4.125-8.25)]}
=100:{250:[450-\((\)500-300)]}
=100:{250:[450-200]}
=100:{250:250}
=100:1
=100
Thực hiện phép tính: 25.23 - [ 164-(12-4)2 ] + 10.2018.
100: {250:[ 450 - (4.53 - 22 .25) ] }.
32.22-32.19
24 . 5-(131-(13-4)2 )
100:(250:(450-(4.53-22.25)))
( là ngoặc nhọn
( là ngoặc vuông
(là ngoặc tròn
600 : [ 450 : {450 -(4.5 mũ 3 - 2 mũ 3 . 5 mũ 2 )}]
312 + (146 -X ) =401
11- (15 + 21 ) + X- (25-9)
2- X +177 - (-5)
X -12 = (-9) - 15
Hình thang ABCD (BC// AD) có ∠ C = 3 ∠ D. Khẳng định nào dưới đây là đúng ?
A. ∠ (A ) = 45 0
B. ∠ (B ) = 45 0
C. ∠ (D ) = 45 0
D. ∠ (D ) = 60 0
Chọn C. (D ) = 45o
Ta có : hình thang ABCD CÓ BC//AD
=> ∠ (C )+ ∠ (D )= 180 0 ( hai góc trong cùng phía bù nhau)
mà ∠ C = 3 ∠ D nên 3 ∠ D+ ∠ D= 180 0 => ∠ D= 45 0
Thực hiện phép tính:
a) 36 : 336 : 200 - 12 + 8 . 20
b) 145 - 130 - 246 - 236 : 2 . 5
c) 100 : 250 : 450 - 4 . 5 3 - 2 2 . 25
d) 798 + 100 : 16 - 2 . 5 2 - 22
e) 6954 + 1525 : 5 + 47 . 19 . 29 - 58 : 2
f) 2 4 . 157 - 2 4 . 58 + 16
600: {450: [450- (4.53 - 23.52)]}
\(600:\left\{450:\left[450-\left(4.5^3-2^3.5^2\right)\right]\right\}\)
\(=600:\left\{450:\left[450-\left(4.125-8.25\right)\right]\right\}\)
\(=600:\left\{450:\left[450-\left(500-200\right)\right]\right\}\)
\(=600:\left\{450:\left[450-300\right]\right\}\)
\(=600:\left\{450:150\right\}\)
\(=600:3\)
\(=200\)
=200 nha bạn