5/7 x x = 32 4/11 ; x = 3/7
23/ 45 * 15/16 * 32/23 + 0,3 * x = 5 3/5 * 7 7/12 * 2/27 * 5/13
[ ( 35 5/7 + 2 3/4 ) - 5 5/7 + 1/4 ] : 11 + x = 3
giúp mình với
1) Thực hiện phép tính:
a) (-3+4):2 b) -4+(-5)-17 c) 4-[(-11)-(2+5)]
5 9 7 9 9 4 3 6 9 3
2) Tìm x biết:
a) 2+7:x=5 b) (-0,75 x +5).4-(-1)=-5 c)-x+5=1,2 d)2+2x=1
3 4 6 2 7 3 6 3 3 2
3) Tìm số nguyên x,y biết:
x-1=1
4 y 2
Bạn ơi, bạn viết lại đề đi. Khó nhìn quá
1. 8/11 + 8/33 x 3/4
7/9 x 3/14 : 5/8
5/12 - 7/32 : 21/16
1.\(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{8\times3}{33\times4}=\dfrac{8\times12}{11\times12}+\dfrac{8\times3}{33\times4}=\dfrac{8\times15}{132}=\dfrac{120}{132}=\dfrac{10}{11}\)
2.\(\dfrac{7}{9}\times\dfrac{3}{14}:\dfrac{5}{8}=\dfrac{7}{9}\times\dfrac{3}{14}\times\dfrac{8}{5}=\dfrac{4}{15}\)
3.\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}=\dfrac{5}{12}-\dfrac{7}{32}\times\dfrac{16}{21}=\dfrac{5}{12}-\dfrac{1}{6}=\dfrac{5-2}{12}=\dfrac{3}{12}=\dfrac{1}{4}\)
`@V.Tr.V`
`8/11+8/33xx3/4=8/11+2/11=10/11`
`7/9xx3/14:5/8=7/9xx3/14xx8/5=[7xx3xx4xx2]/[3xx3xx7xx2xx5]=4/[3xx5]=4/15`
`5/12-7/32:21/16=5/12-7/32xx16/21=5/12-2/12=3/12=1/4`
8/11 + 8/33 x 3/4 = 8/11 + 2/11 = 10/11
7/9 x 3/14 : 5/8 = 1/6 : 5/8 = 4/15
5/12 - 7/32 : 21/16 = 5/12 - 1/6 = 1/4
98775 - 32 x 85 / 67500 - 24 x 236 / 568 + 101598 : 287 / 6875 + 980 -180 \(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}\) / \(\dfrac{8}{11}+\dfrac{8}{33}\) x \(\dfrac{3}{4}\) / 7/9 x 3/14 :5/8 / \(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}\)
ÉT O ÉT
98775 - 32 x 85
=98775 -2720
=96055
67500 - 24 x 236
= 67500 -5664
=61836
568 + 101598 : 287
= 568 +354
=922
6875 + 980 -180
=7855 -180
=7675
\(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}\)
\(=\dfrac{7}{10}-\dfrac{1}{2}\)
= \(\dfrac{1}{5}\)
\(\dfrac{8}{11}+\dfrac{8}{33}x\dfrac{3}{4}\)
\(=\dfrac{8}{11}+\dfrac{2}{11}\)
\(=\dfrac{10}{11}\)
\(\dfrac{7}{9}x\dfrac{3}{14}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}x\dfrac{8}{5}\)
\(=\dfrac{8}{30}\)
\(=\dfrac{4}{15}\)
\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}\)
\(=\dfrac{5}{12}-\dfrac{7}{32}x\dfrac{16}{21}\)
\(=\dfrac{5}{12}-\dfrac{1}{6}\)
\(=\dfrac{5}{12}-\dfrac{2}{12}\)
\(=\dfrac{3}{12}=\dfrac{1}{4}\)
Tìm x
a. (4\(x\)+5) :3 -121 :11=14
b. 2+4+6+..... +\(x\) =2450 (\(x\) chẵn)
c. 1\(x\)32 +7\(x\)8 +4\(x\)=200\(x\)
d.2\(x\)+3\(x\)=1505
Cần gấp ạ
`a, (4x+5) : 3 -121:11=14`
`=> (4x+5) : 3 - 11=14`
`=> (4x+5) : 3 =14+11`
`=> (4x+5) : 3 = 25`
`=> 4x+5=25xx3`
`=>4x+5= 75`
`=> 4x=75-5`
`=>4x=70`
`=>x= 70/4`
`=>x= 35/2`
`b, 2+4+6+...+x=2450`
Số lượng của dãy là :
`(x-2)/2 + 1= (x-2)/2 +2/2= x/2`
Tổng số lượng là :
\(\dfrac{\left(x+2\right)\cdot\dfrac{x}{2}}{2}=\dfrac{\dfrac{x^2}{2}+\dfrac{2x}{2}}{2}=\dfrac{x\left(x+2\right)}{4}\)
\(\dfrac{x\left(x+2\right)}{4}=2450\)
\(\Rightarrow x\left(x+2\right)=2450\cdot4\\ \Rightarrow x\left(x+2\right)=9800\)
`=>x=98`
`c,` `1` nhân `32` sao?
`d, 2x+3x=1505`
`=> (2+3)x=1505`
`=> 5x=1505`
`=> x= 1505:5`
`=>x= 301`
1) 79 - 5 . ( 11 - x ) = 34
2) 32 + 2 . ( 7 - x ) = 40
3) ( 166 - 2 . x ) . 89 = 2 . 811
4) 52 . x - 23 . x = 51
5) 3x + 4 . 3x = 5 . 37
6) 7 . 2x - 2x = 6 . 32
7) 153 - x = 225
8) 4 . 5x - 3 = 97
9) 171 - 3 . 2x = 123
10) 180 - 4 . x5 = 32
1)\(79-5\left(11-x\right)=34\)
\(\Rightarrow79-55+5x=34\)
\(\Rightarrow24+5x=34\)
\(\Rightarrow5x=-10\)
\(\Rightarrow x=-2\)
Vậy \(x=-2\)
2)\(32+2\left(7-x\right)=40\)
\(\Rightarrow32+14-2x=40\)
\(\Rightarrow46-2x=40\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=3\)
Vậy \(x=3\)
3)\(\left(166-2x\right).8^9=2.8^{11}\)
\(\Rightarrow\left(83-x\right).2.8^9=2.8^{11}\)
\(\Rightarrow83-x=8^3\)
\(\Rightarrow83-x=512\)
\(\Rightarrow x=-429\)
Vậy \(x=-429\)
4)\(5^2.x-2^3.x=51\)
\(\Rightarrow x\left(5^2-2^3\right)=51\)
\(\Rightarrow x\left(25-8\right)=51\)
\(\Rightarrow17x=51\)
\(\Rightarrow x=3\)
Vậy \(x=3\)
5)\(3^x+4.3^x=5.3^7\)
\(\Rightarrow3^x\left(1+4\right)=5.3^7\)
\(\Rightarrow5.3^x=5.3^7\)
\(\Rightarrow3^x=3^7\)
\(\Rightarrow x=7\)
Vậy \(x=7\)
6)\(7.2^x-2^x=6.32\)
\(\Rightarrow2^x\left(7-1\right)=6.2^5\)
\(\Rightarrow6.2^x=6.2^5\)
\(\Rightarrow2^x=2^5\)
\(\Rightarrow x=5\)
Vậy \(x=5\)
7)\(15^{3-x}=225\)
\(\Rightarrow15^{3-x}=15^2\)
\(\Rightarrow3-x=2\)
\(\Rightarrow x=1\)
Vậy \(x=1\)
8)\(4.5^x-3=97\)
\(\Rightarrow4.5^x=100\)
\(\Rightarrow5^x=25\)
\(\Rightarrow5^x=5^2\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
9)\(171-3.2^x=123\)
\(\Rightarrow3.2^x=48\)
\(\Rightarrow2^x=16\)
\(\Rightarrow2^x=2^4\)
\(\Rightarrow x=4\)
Vậy \(x=4\)
10)\(180-4.x^5=32\)
\(\Rightarrow4.x^5=148\)
\(\Rightarrow x^5=37\)//Đề có lỗi không ???
Mình làm mãi mới xong nên k đúng hộ mình nha
1) \(79-5.\left(11-x\right)=34\) 2) \(32+2.\left(7-x\right)=40\)
\(5.\left(11-x\right)=79-34\) \(2.\left(7-x\right)=40-32\)
\(5.\left(11-x\right)=45\) \(2.\left(7-x\right)=8\)
\(11-x=45:5\) \(7-x=8:2\)
\(11-x=9\) \(7-x=4\)
\(x=11-9\) \(x=7-4\)
\(x=2\) \(x=3\)
3) \(\left(166-2.x\right).8^9=2.8^{11}\) 4) \(5^2.x-2^3.x=51\)
\(\left(166-2.x\right)=2.8^{11}:8^9\) \(25.x-8.x=51\)
\(\left(166-2.x\right)=2.8^2\) \(\left(25-8\right).X=51\)
\(\left(166-2.x\right)=2.64\) \(17.x=51\)
\(166-2.x=128\) \(x=51:17\)
\(2.x=166-128\) \(x=3\)
\(2.x=38\)
\(x=38:2\)
\(x=19\)
5) \(3^x+4.3^x=5.3^7\) 6) \(7.2^x-2^x=6.32\)
\(3^x+4.3^x=5.2187\) \(7.2^x-2^x=192\)
\(\left(1+4\right).3^x=10935\) \(\left(7-1\right).2^x=192\)
\(5.3^x=10935\) \(6.2^x=192\)
\(3^x=10935:5\) \(2^x=192:6\)
\(3^x=2187\) \(2^x=32\)
\(3^x=3^7\) \(2^x=2^5\)
\(=>x=7\) \(=>x=5\)
7)\(15^{3-x}=225\) 8) \(4.5^x-3=97\)
\(15^{3-x}=15^2\) \(4.5^x=97+3\)
\(=>x=3-2\) \(4.5^x=100\)
\(x=1\) \(5^x=100:4\)
\(5^x=25\)
\(5^x=5^2\)
\(=>x=2\)
9) \(171-3.2^x=123\)
\(3.2^x=171-123\)
\(3.2^x=48\)
\(2^x=48:3\) \(\)
\(2^x=16\)
\(2^x=2^4\)
\(=>x=4\)
Cho m= 3/5 x (6/7 x 8/9 x 10/11 x ... x 32/33) và N = 5/6 x 7/8 x 9/10 x ... x 31/32
đề bài là làm gì vậy bạn?
Tính m x n nhé bạn
Tìm X
a. (3.x-7).5=32
b, 121:11-(4x+8) :3 = 4
c, 121:11 - (4x+8):3=4
a. ( 3x - 7 ) 5 = 32
=> 3x - 7 = 32 : 5
=> 3x - 7 = 32/5
=> 3x = 32/5 + 7
=> 3x = 67/5
=> x = 67/5 : 3
=> x = 67/5 . 1/3
=> x = 67/15
Tương tự tiếp. Chúc bạn học tốt!!!
a) ( 3x - 7 ) . 5 = 32
( 3x - 7 ) = 32 : 5
( 3x - 7 ) = 6,4
3x = 6,4 + 7
3x = 13.4
x = 13,4 : 3
x = 4,4666 ..
Các bạn giúp mình cái ạ mình cần rất gấp mà không ai trả lời ạ :(
1) –45 + 5.(–2x) = 95
2) x.(12 + x).(71 – x) = 0
3) (x – 11).(x + 12).(–x – 13) = 0
4) |2.x – 15| = 7
5) –2.|x + 32| = –112