1230 : [ X : 35 ] = 105
Bài 2. Tìm x, biết:
1) 48 - 3(x + 5) = 24 2) 2x - 20 = 35 : 33 | 3) 1230 : 3(x - 20) = 10 4) 390 - (x - 7) = 169 :13 |
giải giúp em với ạ
a 5(x+35)=515
b 12x-33=3^2.3^3
c 541+(218-x)=73
d 1230:3(x-20)=10
a) 5(x + 35) = 515
x + 35 = 515 : 5
x + 35 = 103
x = 103 - 35
x = 68
b) 12x - 33 = 32.33
12x - 33 = 35
12x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
c) 541 + (218 - x) = 73
218 - x = 73 - 541
218 - x = -468
-x = -468 - 218
-x = -686
x = 686
d) 1230 : 3(x - 20) = 10
410(x - 20) = 10
x - 20 = 10 : 410
x - 20 = 1/41
x = 1/41 + 20
x = 821/41
5(x+ 35 ) = 515
x + 35 = 103
x = 68
12x - 33 = 32 . 33
12x = 276
x = 23
541 + ( 218 - x ) = 73
218 - x = - 468
x = - 250
1230 : 3( x - 20 ) = 10
=> 3x - 60 = 123
=> 3x = 183
=> x = 61
Study well
a) \(5\left(x+35\right)=515\)
\(\left(x+35\right)=515:5\)
\(x+35=103\)
\(x=103-35\)
\(x=68\)
Vậy \(x=68\)
b) \(12x.-33=3^2.3^3\)
\(12x.-33=9.27\)
\(12x.-33=243\)
\(12.x=243+33\)
\(12.x=276\)
\(x=276:12\)
\(x=23\)
Vậy \(x=23\)
c) \(541+\left(218-x\right)=73\)
\(\left(218-x\right)=73-541\)
\(218-x=-468\)
\(x=218-\left(-468\right)\)
\(x=218+468\)
\(x=686\)
Vậy \(x=686\)
d) \(1230:3\left(x-20\right)=10\)
\(3.\left(x-20\right)=1230:10\)
\(3.\left(x-20\right)=123\)
\(\left(x-20\right)=123:3\)
\(x-20=41\)
\(x=41+20\)
\(x=61\)
Vậy \(x=61\)
Chúc bạn học tốt !!!
Tính rồi so sánh kết quả :
a) 35 : 5 và (35 x 4) : (5 x 4) b) 105 : 15 và (105 : 5) : (15 : 5)
a) 35 : 5 và (35 x 4) : (5 x 4)
35:5= 7
(35 x 4) : (5 x 4) = 140 : 20 =7
=> 35 : 5 = (35 x 4) : (5 x 4)
b) 105 : 15 và (105 : 5) : (15 : 5)
105:15 =7
(105 : 5) : (15 : 5)= 7 : 3= 2 (dư 1)
=>105 : 15 > (105 : 5) : (15 : 5)
35:x;105:x và x>5
x x 35 = 105
x x 35 = 105
x = 105 :35
x = 3
Ai tk mk mk tk lai
X x 35 = 105
X = 105 : 35
X = 3
CHúc bạn may mắn!
1260 : (x : 35) = 105
1260:(x:35)=105
x:35=1260:105
x:35=12
x=12x35
x=420
Vậy x=420.
\(\text{1260 : (x : 35) = 105}\)
\(\left(x:35\right)=1260:105\)
\(x:35=12\)
\(x=12\times35\)
\(420\)
15:(x+2) = 3
20:(1+x) = 2
5(x+35) = 515
541+(218-x) = 73
1230:3 (x-20) = 10
48-3(x+5) = 24
4x + 18 : 2=13
X-48:16 = 37
1) 15:(x+2) = 3
x + 2 = 15 : 3
x + 2 = 5
x = 5 - 2
x = 3
2) 20:(1+x) = 2
1 + x = 20 : 2
1 + x = 10
x = 10 - 1
x = 9
3) 5(x+35) = 515
x + 35 = 515 : 5
x + 35 = 103
x = 103 - 35
x = 68
4) 541+(218-x) = 73
218 - x = 73 - 541
218 - x = -468
x = 218 - ( - 468 )
x = 686
5) 1230:3 (x-20) = 10
410 . ( x - 20 ) = 10
x - 20 = 10 : 410
x - 20 = 1/41
x = 1/41 + 20
x = 821/41
6) 48-3(x+5) = 24
3( x + 5 ) = 48 - 24
3( x + 5 ) = 24
x + 5 = 24 : 3
x + 5 = 8
x = 8 - 5
x = 3
7) 4x + 18 : 2=13
4x + 9 = 13
4x = 13 - 9
4x = 4
x = 1
8) X-48:16 = 37
x - 3 = 37
x = 37 + 3
x = 40
a, 15: (x+2) = 3
x+2 =15:3
x+2 = 5
x = 5-2
x = 3
b, 20: (1+x) = 2
1+x = 20:2
1+x = 10
x = 10-1
x = 9
c, 5(x+35) = 515
x+35 = 515 :5
x+35 = 103
x = 103-35
x = 68
d, 541+ (218-x) = 73
218-x = 73-541
218-x = - 468
x = 218 - (-468)
x = 218 + 468
x = 686
e, 1230:3. (x-20) = 10
410(x-20) = 10
x-20 = 10: 410
x-20 = 1/41
x = 1/41 + 20
x = 821/41
f, 48-3(x+5) = 24
3(x+5) = 48-24
3(x+5) = 24
x+5 = 24:3
x +5 = 8
x = 8-5
x =3
g, 4x + 18 : 2 = 13
4x + 9 = 13
4x = 13-9
4x = 4
x = 4:4
x = 1
j, x - 48:16 = 37
x- 3 = 37
x = 37+3
x = 40
tìm x
a; 35-15+x=70
b; 568-(2.x+14)=15
c; x-105:21=15
d; (x-105).21=15
a) 35-15+x=70
=> 20+x=70
=> x=50
b) 568-(2x+14)=15
=> 2x+14=553
=> 2x=539
=> x=269,5
c) x-105:21=15
=> x-5=15
=> x=20
d) (x-105)*21=15
=> x-105=5/7
=> x=5/7+105
=> x=740/7
a, 35 - 15 + x = 70 b, 568 - (2.x + 14 )= 15
x = 70 - 35 + 15 2.x + 14 = 568 - 15
x = 50 2.x + 14 =553 => 2.x =553-14=539 =>x=539 : 2 =269.5
c, x - 105 : 21 =15 d, (x - 105) . 21 = 15
x - 105 = 15 x 21 x - 105 = 15 : 21
x - 105 = 315 x - 105 = \(\frac{5}{7}\)
x = 315+105 x = \(\frac{5}{7}\)+ 105
x = 420 x = \(\frac{740}{7}\)
a/ 35-15+x=70 b/ 569-(2x+14)=15 c/ x-105:21=15 d/(x-105).21 =15
20+x =70 2x+14 =569-15 x-5 =15 x-105 =15:21
x =70-20 2x+14 =554 x =15+5 x-105 =5/7
x =50 2x =554-14 x =20 x=5/7+105
x=740/7
2x =540
x =540 : 2
x =270
a) 4x - 5 = 35 - (12 - 8)
b) 105 - (x + 7) = 27 : 25