c) 23.15 – [ 115 + ( 12 - 25)]
Tính
a, 23.15 - [ 115 + ( 12 - 25 ) ]
1. Tính
a, 23.15 - [ 115 + ( 12 - 25 ) ]
Thực hiện phép tính hợp lý.
a, 23.15 – [ 115 + ( 12 - 25)]
b, (85 + 106 +17) – (85+17
c, \(\frac{5}{12}\)+ \(\frac{3}{16}\)
Thực hiện phép tính:
a)23.15 - [115-(12-5)2 ]
b) 100 : {250 : [450 - (2.53 - 23.25)]}
a) = 8 . 15 - [115- 72 ]
= 8 . 15 - [115- 49 ]
= 120 - 56
= 64
b) = 100 : {250 : [450 - (2.125 - 8.25)]}
= 100 : {250 : [450 - (250 - 200 )]}
= 100 : {250 : [450 - 50]}
= 100 : {250 :400}
= 100 : 0,265
= 0,00265
=
\(a,2^3.15-\left[115-\left(12-5\right)^2\right]\)
\(=8.15-\left[115-\left(12-5\right)^2\right]\)
\(=120-\left[115-7^2\right]\)
\(=120-\left[115-49\right]\)
\(=120-66\)
\(=54\)
\(b,100:\left\{250:\left[450-\left(2.5^3-2^3.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(2.125-8.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(250-200\right)\right]\right\}\)
\(=100:\left\{250:\left[450-50\right]\right\}\)
\(=100:\left\{250:400\right\}\)
\(=100:0,625\)
\(=160\)
a: \(2^3\cdot15-\left[115-\left(12-5\right)^2\right]\)
\(=8\cdot15-115+7^2\)
\(=54\)
b: \(100:\left\{250:\left[450-\left(2\cdot5^3-2^3\cdot25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-50\right]\right\}\)
\(=100:\left\{250:400\right\}\)
\(=100:\dfrac{5}{8}=160\)
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
Tính giá trị biếu thức
a) 23.15 -[115-(12-5)2 ]
b)5.[(85 - 35 : 7) :8 + 90 ] - 50
c){[261 - ( 36-31)3.2 ]-9}.1001
d)3.102 - [1200 - ( 42 - 2.3)3]
\(a)2^3\cdot15-[115-(12-5)^2]\\=8\cdot15-(115-7^2)\\=120-(115-49)\\=120-66\\=54\\---\\b)5\cdot[(85-35:7):8+90]-60\\=5\cdot[(85-5):8+90]-60\\=5\cdot(80:8+90)-60\\=5\cdot(10+90)-60\\=5\cdot100-60\\=500-60\\=440\)
\(---\)
\(c,\left\{\left[261-\left(36-31\right)^3\cdot2\right]-9\right\}\cdot1001\)
\(=\left[\left(261-5^3\cdot2\right)-9\right]\cdot1001\)
\(=\left[\left(261-125\cdot2\right)-9\right]\cdot1001\)
\(=\left[\left(261-250\right)-9\right]\cdot1001\)
\(=\left(11-9\right)\cdot1001\)
\(=2\cdot1001\)
\(=2002\)
\(---\)
\(d,3\cdot10^2-\left[1200-\left(4^2-2\cdot3\right)^3\right]\)
\(=3\cdot100-\left[1200-\left(16-6\right)^3\right]\)
\(=300-\left(1200-10^3\right)\)
\(=300-\left(1200-1000\right)\)
\(=300-200\)
\(=100\)
#\(Toru\)
a) 23.15 -[115-(12-5)2 ]
= 23.15 -[115-36]
= 8.15 -79
= 120-79
=41
b)5.[(85 - 35 : 7) :8 + 90 ] - 50
=5 .[80:8+90]-50
=5.100-50
=500-50
=450
c){[261 - ( 36-31)3.2 ]-9}.1001
={[261 - 125.2 ]-9}.1001
={[261 -250 ]-9}.1001
={11-9}.1001
=2.1001
=2002
d)3.102 - [1200 - ( 42 - 2.3)3]
=3.100-[1200 -(16-6)3 ]
=300-[1200-1000]
=300-200
=100
c) 2 mũ 3.15 – [ 115 + ( 12 - 25)]
Tính
a) 1 5 + 2 5 =
b) 3 × 1 2 =
c) 1 - 2 3 + 1 6 =
d) 1 1 5 ÷ 1 1 2 =
e) 3 5 + 2 5 × 1 6 =
a) 1 5 + 2 5 = 1 + 2 5 = 3 5
b) 3 × 1 2 = 3 × 1 2 = 3 2
c) 1 - 2 3 + 1 6 = 1 - 12 18 + 3 18 = 1 - 15 18 = 3 18 = 1 6
d) 1 1 5 ÷ 1 1 2 = 6 5 ÷ 3 2 = 12 15 = 4 5
e) 3 5 + 2 5 × 1 6 = 3 5 + 2 30 = 20 30 = 2 3
Tính:
a) 1 5 + 2 5 =
b) 3 × 1 2 =
c) 1 - 2 3 + 1 6 =
d) 1 1 5 ÷ 1 1 2 =
e) 3 5 + 2 5 × 1 6 =
a) 1 5 + 2 5 = 1 + 2 5 = 3 5
b) 3 × 1 2 = 3 × 1 2 = 3 2
c) 1 - 2 3 + 1 6 = 1 - 12 18 + 3 18 = 1 - 15 18 = 3 18 = 1 6
d) 1 1 5 ÷ 1 1 2 = 6 5 ÷ 3 2 = 12 15
e) 3 5 + 2 5 × 1 6 = 3 5 + 2 30 = 20 30 = 2 3