x < 4/5 - 2/3
4/6 - 2/3 <x <14 / 4 - 1/2
Tìm x
5+5+8+0+6+4+5+2+4+1+1+2+3+4+5+6+6+7+8+9+100000000+45638+78536 x 12345 x 34 x 0 +100=
5+5+8+0+6+4+5+2+4+1+1+2+3+4+5+6+6+7+8+9+100000000+45638+78536 x 12345 x 34 x 0 +100=100045829
CHÚC BẠN HỌC GIỎI
TK MÌNH NHÉ
Dạ, cảm ơn anh, nhưng đây kg phải là đáp án của em. TRẻ con còn biết, mà người lại kg .Anh đừng tự tin, nhanh rồi cũng có lúc sai!!!
1. x - 8 +32= 68
2. x +8+32=68
3. 98-x +34=43
4. 98+x-34=43
5. x :5:4=800
6. 18+x=384:8
7. (84,6-2 x x):3,02= 5,1
8. x x5= 120:6
9. (15x 24-x) :0,25= 100:0,25
1. \(x-8+32=68\)
\(x-8=68-32\)
\(x-8=36\)
\(x=36+8\)
\(x=44\)
_____
2. \(x+8+32=68\)
\(x+8=68-32\)
\(x+8=36\)
\(x=36-8\)
\(x=28\)
_____
3. \(98-x+34=43\)
\(98-x=43-34\)
\(98-x=9\)
\(x=98-9\)
\(x=89\)
_____
4. \(98+x-34=43\)
\(98+x=43+34\)
\(98+x=77\)
\(x=77-98\)
\(x=-21\)
_____
5. \(x:5:4=800\)
\(x:5=800.4\)
\(x:5=3200\)
\(x=3200.5\)
\(x=16000\)
_____
6. \(18+x=384:8\)
\(18+x=48\)
\(x=48-18\)
\(x=30\)
_____
7. \(\left(84,6-2\times x\right):3,02=5,1\)
\(84,6-2.x=5,1.3,02\)
\(84,6-2.x=15,402\)
\(2.x=84,6-15,402\)
\(2.x=69,198\)
\(x=69,198:2\)
\(x=34,599\)
_____
8. \(x\times5=120:6\)
\(x.5=20\)
\(x=20:5\)
\(x=4\)
_____
9. \(\left(15\times24-x\right):0,25=100:0,25\)
\(\left(15.24-x\right):0,25=400\)
\(15.24-x=400.0,25\)
\(15.24-x=100\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
1,x-8+32=68
=>x-8=68-32=36
=>x=36+8=42
2,x+8+32=68
=>x+8=68-32=36
=>x=36-8=28
3,98-x+34=43
=>98-x=43-34=9
=>x=98-9=89
4,98+x-34=43
=>98+x=43+34=77
=>x=77-98=-21
5,x:5:4=800
=>x:20=800
=>x=800x20=16000
6,18+x=384:8=48
=>x=48-18=30
7,(84,6-2x):3,02=5,1
=>84,6-2x=5,1x3,02=15,402
=>2x=84,6-15,402=69,198
=>x=69,198:2=34,599
8,5x=120:6=20
=>x=20:5=4
9,(15x24-x):0,25=100:0,25=400
=>360-x=400x0,25=100
=>x=360-100=260.
1. \(...\Rightarrow x+24=68\Rightarrow x=68-24=44\)
2. \(...\Rightarrow x+40=68\Rightarrow x=68-40=28\)
3. \(...\Rightarrow3^{2\left(8+x\right)}=9=3^2\Rightarrow2\left(8+x\right)=2\Rightarrow8+x=1\Rightarrow x=-7\)
4. \(...\Rightarrow3^{2\left(8+x\right)}=77\) (bạn xem lại đề)
5. \(...\Rightarrow x:5=800.4\Rightarrow x:5=3200\Rightarrow x=3200.5=16000\)
6. \(...\Rightarrow18+x=48\Rightarrow x=48-18=30\)
7. \(...\Rightarrow84,6-2x=5,1.3,02=15,402\Rightarrow2x=84,6-15,402\Rightarrow2x=69,198\Rightarrow x=34,599\)
8. \(...\Rightarrow5.x=20\Rightarrow x=20:5=4\)
9. \(\left(360-x\right):0,25=400\Rightarrow360-x=400.0,25=100\Rightarrow x=400-100=300\)
Đặt tính rồi tính:
a) 14 x 6 20 x 5 34 x 7 66 x 6
......... ........... .......... ...........
......... ........... .......... ...........
......... ........... .......... ...........
b) 86 : 2 63 : 3 80 : 4 83 : 4
......... ........... .......... ...........
......... ........... .......... ...........
......... ........... .......... ...........
1-2-2-1-2-1-2-1-2-1--45-4356-42-------32423432---5-45-54535-435-34-5-35-2-5-4-52-5-54-353--3-5--5-34-5-3--4-47-87-8-787-9-76-8--34-54-6----34-3-31-4-31-423-34-1-134-41-4232-431-321------------546-3----------------2315-413-513465146-456-4-164-316361-4363411111111111111=
-4.3634111e+18
HT
@acquybemon
bai 1 : (3.x-6).3 = 3 mu 4
bài 2 :12.x -34 = 3 mũ 2 nhân 3 mũ 5
(3x - 6).3 = 34
3x - 6 = 34 : 3
3x - 6 = 33
3x - 6 = 27
3x = 27 + 6
3x =33
x = 33:3
x=11
12x - 34 = 32.35
12x - 34 = 37
12x - 34 = 2187
12x = 2187 + 34
12x = 2221
x = 2221:12
x=2221/12
Cấp độ 1 : \(5+3=8\)
Cấp độ 2 : \(34-12=22\)
Cấp độ 3 : \(34\times6=204\)
Cấp độ 4 : \(38\times26=988\)
Cấp độ 5 : \(34,5\times73,732=2543,54\)
a) x - = b) . c)
) : e) f) .
x
x
d x x x x x
3 13 2 4 3 7 2
1 3
5 25 3 5 10 15 3
4 5 1 7 2 11 1 1
3 15 1 3
5 7 6 5 5 2 3 2
1.Tính:
34 x 2 =
46 x 6 =
56 x 5 =
11 x 5 =
47 x 5 =
45 x 5 =
77 x 6 =
90 x 5 =
99 x 5 =
12 x 6 =
11 x 4 =
23 x 4 =
45 x 6 =
2. Tìm x:
34 x X = 102
3. Tính :
45 : 6 = ....(dư...)
34 : 5 = ....(dư...)
45 : 5 =
54 : 6 =
4. Sắp xếp các số 1,2,3,4,5,6,7,8,9,0 thành số chẫn có hai số và bao nhiêu số có hai chữ số chẫn ?
1) Tính:
34 x 2= 68; 46 x 6=276; 56 x 5= 280; 11 x 5= 55; 47 x 5= 235; 45 x 5= 225; 77 x 6= 462; 90 x 5= 450; 12 x 6= 72; 11x4=44; 23x4=92; 45 x 6= 270.
2) Tìm x:
34 x X = 102
=> X = 102 - 34
=> X = 68
3) Tính;
45 : 6 = 7 ( dư 3)
34 : 5 = 6 ( dư 4)
45 : 5 = 9
54 : 6 = 9
4) .....
a) các số là: 12,14,16,18,10;22,24,26,28,20;32,34,36,68,30;42,44,46,48,49,40;52,54,56,58,50;62,64,66,68,60;72,74,76,78,70;82,84,86,88,80;92,94,96,98,90.
b) có tất cả 40 số.
bài 1
34x2=68
46x6=276
56x5=280
11x5=55
47x5=235
45x5=225
77x6=462
90x5=450
99x5=495
12x6=72
11x4=44
23x4=92
45x6=270
Bài 2
34 x X = 102
X = 102 : 34
X = 3
Bài 3
45:6=7(dư 3)
34:5=6(dư 4)
45:5=9
54:6=9
Bài 4
45
k nha,bài 4 mình ko chắc lắm
34 x 2 = 68 46 x 6 = 276 56 x 5 =280 11 x 5 = 55 47 x 5 = 235 45 x 5 = 225 77 x 6 = 462 90 x 5 = 450 99 x 5 =495 12 x 6 = 72 11 x 4 = 44 23 x 4 = 92 45 x 6 = 270
Bai 2: Tim X 34 x X= 102 x= 102:34 x= 3
tính bằng cách thuận tiện nhất:
3/7+2/5+4/7
20/34+4/9+7/17
48 x 2 + 96 + 48 x 6
`3/7+2/5+4/7`
`=(3/7+4/7)+2/5`
`=1+2/5`
`=5/5+2/5`
`=7/5`
`20/34+4/9+7/17`
`=(20/34+7/17)+4/9`
`=(20/34+14/34)+4/9`
`=34/34+4/9`
`=1+4/9`
`=9/9+4/9`
`=13/9`
`48xx2+96+48xx6`
`=48xx2+48xx2+48xx6`
`=48xx(2+2+6)`
`=48xx10`
`=480`
câu thứ hai thì làm như này em nhé:
\(\dfrac{20}{34}\) + \(\dfrac{4}{9}\) + \(\dfrac{7}{17}\)
= (\(\dfrac{20}{34}\) + \(\dfrac{7}{17}\)) + \(\dfrac{4}{9}\)
= (\(\dfrac{10}{17}\) + \(\dfrac{7}{17}\)) + \(\dfrac{4}{9}\)
= 1 + \(\dfrac{4}{9}\)
= \(\dfrac{13}{9}\)
Tính đạo hàm:
1) \(y = \sin^2 \sqrt {4x+3}\)
2) \(y = \dfrac{3}{4}x^4 - \dfrac{34}{\sqrt{x}} + \pi\)
3) \(y = \sqrt{\dfrac{\sin4x}{\cos(x^2+2)}}\)
4) \(y = \dfrac{1}{\sqrt{\sin^2(6-x)+4x}}\)
5) \(y = x.\sin^2\left(\dfrac{2x-1}{4-x}\right)\)
6) \(y = \dfrac{4}{3}x^3 + \dfrac{3}{2\sqrt{x}} + \sqrt{2x}\)
7) \(y = \sqrt{\cot^3(x^2-1)} + \left(\dfrac{\sin2x}{\cos3x}\right)^4\)
8) \(y = \dfrac{\tan3x}{\cot^23x} - (\sin2x + \cos3x)^5\)
9) \(y = \cot^65x - \cos^43x + \sin3x\)
Coi như tất cả các biểu thức cần tính đạo hàm đều xác định.
1.
\(y'=2sin\sqrt{4x+3}.\left(sin\sqrt{4x+3}\right)'=2sin\sqrt{4x+3}.cos\sqrt{4x+3}.\left(\sqrt{4x+3}\right)'\)
\(=sin\left(2\sqrt{4x+3}\right).\dfrac{4}{2\sqrt{4x+3}}=\dfrac{2sin\left(2\sqrt{4x+3}\right)}{\sqrt{4x+3}}\)
2.
\(y'=3x^3+\dfrac{17}{x\sqrt{x}}\)
3.
\(y'=\dfrac{1}{2\sqrt{\dfrac{sin4x}{cos\left(x^2+2\right)}}}.\left(\dfrac{sin4x}{cos\left(x^2+2\right)}\right)'\)
\(=\dfrac{1}{2\sqrt{\dfrac{sin4x}{cos\left(x^2+2\right)}}}.\dfrac{4cos4x.cos\left(x^2+2\right)+2x.sin4x.sin\left(x^2+2\right)}{cos^2\left(x^2+2\right)}\)
4.
\(y'=-\dfrac{\left(\sqrt{sin^2\left(6-x\right)+4x}\right)'}{sin^2\left(6-x\right)+4x}=-\dfrac{\left[sin^2\left(6-x\right)+4x\right]'}{2\sqrt{\left[sin^2\left(6-x\right)+4x\right]^3}}\)
\(=-\dfrac{2sin\left(6-x\right).\left[sin\left(6-x\right)\right]'+4}{2\sqrt{\left[sin^2\left(6-x\right)+4x\right]^3}}=-\dfrac{-2sin\left(6-x\right).cos\left(6-x\right)+4}{2\sqrt{\left[sin^2\left(6-x\right)+4x\right]^3}}\)
\(=\dfrac{sin\left(12-2x\right)-4}{2\sqrt{\left[sin^2\left(6-x\right)+4x\right]^3}}\)
5.
\(y'=sin^2\left(\dfrac{2x-1}{4-x}\right)+2x.sin\left(\dfrac{2x-1}{4-x}\right).\left[sin\left(\dfrac{2x-1}{4-x}\right)\right]'\)
\(=sin^2\left(\dfrac{2x-1}{4-x}\right)+2x.sin\left(\dfrac{2x-1}{4-x}\right).cos\left(\dfrac{2x-1}{4-x}\right).\left(\dfrac{2x-1}{4-x}\right)'\)
\(=sin^2\left(\dfrac{2x-1}{4-x}\right)+x.sin\left(\dfrac{4x-2}{4-x}\right).\dfrac{7}{\left(4-x\right)^2}\)
8.
\(y=tan^33x-\left(sin2x+cos3x\right)^5\)
\(\Rightarrow y'=3tan^23x.\left(tan3x\right)'-5\left(sin2x+cos3x\right)^4.\left(sin2x+cos3x\right)'\)
\(=\dfrac{9.tan^23x}{cos^23x}-5\left(sin2x+cos3x\right)^4.\left(2cos2x-3sin3x\right)\)
9.
\(y'=6cot^55x.\left(cot5x\right)'-4cos^33x.\left(cos3x\right)'+3cos3x\)
\(=-\dfrac{30.cot^55x}{sin^25x}+12cos^33x.sin3x+3cos3x\)