92-54=
52+23=
79-52
27+47
38-23
Tìm x: 9 2 − 2 3 − x + 7 4 = − 5 4
9 2 − 2 3 − x + 7 4 = − 5 4 2 3 − x + 7 4 = 9 2 − − 5 4 2 3 − x + 7 4 = 9 2 + 5 4 2 3 − x + 7 4 = 23 4 x + 7 4 = 2 3 − 23 4 x + 7 4 = 8 − 69 12 x + 7 4 = − 57 12 x + 7 4 = − 19 4 x = − 19 4 − 7 4 x = − 26 4 x = − 13 2
Giải hộ mình nha
b) 23×79+52×21+77×79+21×48
b) 23.79 + 52.21 + 77.79 + 21.48
= 79(23+77) + 21(52+48)
= 79 .100 + 21 .100
= (79+21) .100 = 100.100 = 10000
=(23+77)*79+(48+52)*21 =7900+2100 =10000
23*79+52*21+77*79+21*48
=(23+77)*79+(52+48)*21
=100*79+100*21
=7900+2100=10000
bài 3 :
4.33 - 75 : 52
7. 24- 16. 3
23. 17- 23. 14
45 + 54 : 32
17. 85 + 15. 17 - 120
324 : 321 + 22. 23
92 + 43 : 8
5. 23 + 711 : 79 - 12023
a: \(4\cdot3^3-75:5^2\)
\(=4\cdot27-\dfrac{75}{25}\)
=108-3
=105
b: \(7\cdot2^4-16\cdot3\)
\(=16\cdot7-16\cdot3\)
=16(7-3)
=16*4=64
c: \(2^3\cdot17-2^3\cdot14\)
\(=8\cdot17-8\cdot14\)
=8(17-14)
=8*3
=24
d: \(45+\dfrac{54}{3^2}\)
\(=45+\dfrac{54}{9}\)
=45+6
=51
e: \(17\cdot85+15\cdot17-120\)
\(=17\left(85+15\right)-120\)
=1700-120
=1580
f: \(\dfrac{3^{24}}{3^{21}}+2^2\cdot2^3\)
\(=3^3+2^5\)
=27+32
=59
g: \(92+4^3:8\)
=92+64/8
=92+8
=100
h: \(5\cdot2^3+7^{11}:7^9-1^{2023}\)
\(=5\cdot8+49-1\)
=40+48
=88
Tính nhanh
21/69 + 16/92 + 12/23 - 32/54
Là phân số nha. Giúp mình với
=(7x3)/(3x23)+(4x4)/(23x4)+12/23-(16x2)/27x2)
=7/23+4/23+12/23-16/27
=23/23-16/27
=1-16/27=11/27
3) 287 + 121 + 513 + 79
4) 17.34 + 17.39 + 27.17
5) 4. 52 – 64: 42
6) 25 . 101 – 25 .1010
7) 72 + [ 62 – ( 102 – 4 . 16 )]
8) 2x – 138 = 23. 32
9) [120 : 4 – (23 -17) . 5]. 20212022
6567578.X.6567578.Y:6098+6099+......+10000=200000000
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20 * 21 * 22 * 23 * 24 * 25 * 26 * 27 * 28 * 29 * 30 * 31 * 32 * 33 * 34 * 35 * 36 * 37 * 38 * 39 * 40 * 41 * 42 * 43 * 44 * 45 * 46 * 47 * 48 * 49 * 50 * 51 * 52 * 53 * 54 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
So sánh :
1+52+54+...+540 với 542.2 : 23
Mình cần gấp các bạn giúp mình với :<
Đặt \(A=1+5^2+5^4+...+5^{40}\)
\(\Rightarrow25A=5^2+5^4+5^6+...+5^{42}\)
Lấy \(25A-A=\left(5^2+5^4+5^6+...+5^{42}\right)-\left(1+5^2+5^4+...+5^{40}\right)\)
\(\Rightarrow24A=5^{42}-1\)
\(\Rightarrow A=\dfrac{5^{42}-1}{24}\)
nguyễn thị hương giang, cúm ơn rất nhìu !!
Bài 1: Viết dấu , = vào chỗ chấm.
1 …. 2
3 … 1
3 ... 4
3 … 3
5 … 2
5 ... 2
5 … 4
2 … 3
1 ... 5
2 … 5
4 … 1
4 ... 4
4 … 3
5 … 5
2 ... 3
3 .... 5
1 .... 4
3 .... 1
1 < 2
3 > 1
3 < 4
3 = 3
5 > 2
5 > 4
2 < 3
1 < 5
4 > 1
4 = 4
4 > 3
5 = 5
2 < 3
3 < 5
1 < 4
3 > 1
14x + 54 = 82
175 + (30 - x) = 2001
1551- 10 (x + 1) = 55
5 . (x + 12) + 22 = 92
6 . (x + 23) + 40 = 100
14x + 54 = 82
14x = 28
x = 2
175 + (30 - x) = 2001
30 - x = 1826
x = 30 - 1826
x = - 1796
1551 - 10 ( x + 1 ) = 55
10(x + 1) = 1496
x + 1 = 149,6
x = 148,6
5 . (x + 12) + 22 = 92
5 . (x + 12) = 70
x + 12 = 14
x = 2
6 . (x + 23) + 40 = 100
6 . (x + 23) = 60
x + 23 = 10
x = - 13
\(14x+54=82\)
\(\Leftrightarrow14x=82-54\)
\(\Leftrightarrow14x=28\)
\(\Leftrightarrow x=2\)
Vậy \(x=2\)
\(175+\left(30-x\right)=2001\)
\(\Leftrightarrow30-x=2001-175\)
\(\Leftrightarrow30-x=1826\)
\(\Leftrightarrow x=-1796\)
Vậy \(x=-1796\)
\(1551-10\left(x+1\right)=55\)
\(\Leftrightarrow10.\left(x+1\right)=1551-55\)
\(\Leftrightarrow10.\left(x+1\right)=1496\)
\(\Leftrightarrow x+1=\frac{1496}{10}\)
\(\Leftrightarrow x=\frac{1486}{10}\)
Vậy \(x=\frac{1486}{10}\)
\(5.\left(x+12\right)+22=92\)
\(\Leftrightarrow5.\left(x+12\right)=70\)
\(\Leftrightarrow x+12=14\).
\(\Leftrightarrow x=2\)
Vậy \(x=2\)
\(6.\left(x+23\right)+40=100\)
\(\Leftrightarrow6.\left(x+23\right)=60\)
\(\Leftrightarrow x+23=10\)
\(\Leftrightarrow x=-13\)
Vậy \(x=-13\)