giúp với !
2.52.32+{[2.53-(5x+4).5]:(22.3.5)}=453
giúp với !hu hu
2.52.32+{[2.53-(5x+4).5]:(22.3.5)}=453
làm nhanh nha mai phải nộp rồi
2.25.9+{[2.125-25.x-20]:(4.3.5)}=453
450 +{[250-25.x -20]:60 }=453
450 +{[230-25.x] :60 }=453
450 +{23/6-13/30x }=453
23/6-5/12x =453-450
46/12-5/12x =3
(46-5x)/12 =3
46-5x =3.12=36
5x =46-36=10
x=2
Mình viết cách ra cho dễ hiểu đó
Tim x
2.5^2.3^2+{[2.5^3-(5x+4).5]}:(262.3.5)}=453
2.25.9+{[2.125-(5x+4).5]:(4.3.5)]}=453
kien thuc lop 6 do nha ai lam dc like cho
2.25.9 + {[ 2.125 - ( 5x + 4 ).5 ] : ( 4.3.5 )]} = 453
= 2.25.9 + 250 - ( 5x + 4 ).5 ] : 12.5 = 453
= 50.9 + [ 250 - ( 5x + 4 ).5 ] : 60 = 453
= 450 + 250 - ( 5x + 4 ).5 = 453.60
= 450 + 250 - ( 5x + 4 ) = 453 : 5
= 450 + 250 - ( 5x + 4 ) = 90,6
= 450 + 250 - 5x = 90,6 - 4
= 450 + 250 - 5x = 86,6
= 700 - 5x = 86,6
= 86,6 + 700
= 5x = 786,6
= 786,6 : 5
= 157,32
2.25.9 + {[ 2.125 - ( 5x + 4 ).5 ] : ( 4.3.5 )]} = 453
= 2.25.9 + 250 - ( 5x + 4 ).5 ] : 12.5 = 453
= 50.9 + [ 250 - ( 5x + 4 ).5 ] : 60 = 453
= 450 + 250 - ( 5x + 4 ).5 = 453.60
= 450 + 250 - ( 5x + 4 ) = 453 : 5
= 450 + 250 - ( 5x + 4 ) = 90,6
= 450 + 250 - 5x = 90,6 - 4
= 450 + 250 - 5x = 86,6
= 700 - 5x = 86,6
= 86,6 + 700
= 5x = 786,6
= 786,6 : 5
= 157,32
Answer : 157,32
1.3.5.7x...x99 Với 51/2.52/2.53/2x...x100/2
So sánh 2 Tích trên
giúp mình với
24.55+5 mũ 2.53
\(24\cdot55+5^2\cdot53\)
\(=24\cdot55+25\cdot53\)
\(=1320+1325\)
\(=2645\)
24 x 55 + \(5^2\)x 53
= 1320 + 25 x 53
= 1320 + 1325
= 2645
\(24.55+5^2.53\)
\(=24.55+25.53\)
\(=24.55+\left(24+1\right).53\)
\(=24.55+24.53+53\)
\(=24\left(55+53\right)+53\)
\(=24.108+53\)
\(=2645\)
a)Tìm số nguyên âm a,biết:
a^2-(3/5)^2=1/1.2+1/2.7+1/7.5+1/5.13+1/13.8+1/8.19+1/19.11+1/11.25
b)So sánh: C=1.3.5.7....99 với D=51/9.52/2.53/2....100/2
Giúp mình với mình đang cần gấp
nè mọi người ơi giải giúp mjk bài này với :
A= 1.3.5 .............................99
B=51/2.52/2.53/2.........................100/2
Hãy chứng minh rằng A = B
Thực hiện phép tính:
a) {[(37 + 13) : 5] - 45 : 5} .7
62.10 : {780 : [103 - (2.53 + 35.14)]}
\(a,\left\{\left[\left(37+13\right):5\right]-45:5\right\}.7\)
\(=\left\{\left[50:5\right]-45:5\right\}.7\)
\(=\left\{10-45:5\right\}.7\)
\(=\left\{10-9\right\}.7\)
\(=1.7=7\)
\(6^2.10:\left\{780:\left[10^3-\left(2.5^3+35.14\right)\right]\right\}\)
\(=36.10:\left\{780:\left[1000-\left(2.125+35.14\right)\right]\right\}\)
\(=360:\left\{780:\left[1000-\left(250+490\right)\right]\right\}\)
\(=360:\left\{780:\left[1000-740\right]\right\}\)
\(=360:\left\{780:260\right\}\)
\(=360:3=120\)
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: \(100:\left\{250:\left[450-\left(2\cdot5^3-2^3\cdot25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-50\right]\right\}\)
\(=100:\left\{250:400\right\}\)
\(=100:\dfrac{5}{8}=160\)