Tìm x
a)x :12 =24
b)x +23=56
Tìm x
a) 3x – 2 = 19
b) [43 - (56 - x)].12 = 384
c) 3x.2 + 15 = 33
a) 3x – 2 = 19
3x = 19 + 2
3x = 21
x = 21:3
x = 7
b) [43 - (56 - x)].12 = 384
43 – (56 – x) = 384:12
43 – (56 – x) = 32
56 – x = 43 – 32
56 – x = 11
x = 56 – 11
x = 45
c) 3x.2 + 15 = 33
3x.2 = 33 - 15
3x.2 = 18
3x = 18 : 2
3x = 9
3x = 33
x = 2.
a) 3x – 2 = 19
3x = 19 + 2
3x = 21
x = 21:3
x = 7
b) [43 - (56 - x)].12 = 384
43 – (56 – x) = 384:12
43 – (56 – x) = 32
56 – x = 43 – 32
56 – x = 11
x = 56 – 11
x = 45
c) 3x.2 + 15 = 33
3x.2 = 33 - 15
3x.2 = 18
3x = 18 : 2
3x = 9
3x = 33
x = 2.
tìm x
aX+4/9=19/24
b)X-5/8=17/12
a: x+4/9=19/24
=>x=19/24-4/9=25/72
b: x-5/8=17/12
=>x=5/8+17/12=49/24
\(x+\)\(\dfrac{4}{9}=\dfrac{19}{24}\)
\(x=\)\(\dfrac{19}{24}-\dfrac{4}{9}\)
\(x=\)\(\dfrac{171-96}{216}=\dfrac{75}{216}\)
\(x-\)\(\dfrac{5}{8}=\dfrac{17}{12}\)
\(x=\)\(\dfrac{17}{12}+\dfrac{5}{8}\)
\(x=\)\(\dfrac{136+60}{96}=\dfrac{196}{96}\)
`a)`
`x+4/9=19/24`
`x=19/24-4/9=25/72`
`b)`
`x-5/8=17/12`
`x=5/8+17/12=49/24`
`@An`
giúp mình khẩn cấp nha mn, nếu đúng thì mk thik cho:))
tìm tổng của tất cả số nguyên thỏa mãn:
a) -23<x<24
b) -11≤x<9
thanks mn nha
sao lạ vại men, ko còn ý kiến nào hay hơn à
U LÀ TRỜI
Tìm x
a/ 1 3 + 2 3 : x = − 1 2 3
b/ 1 2 − 2 . x + 3 4 = 5 6
c/ x 2 + x 3 = − 1
d/ 3 x − 1 = 21 16
12+34+56+78+56=45+x-23=1234-x+56
bài 1 tìm x
a 12-5x=35:5
b 4-2(1-x)=23:4
\(a,12-5x=35:5\\12-5x=7\\5x=12-7\\5x=5\\x=5:5\\x=1\\b,4-2(1-x)=2^3:4\\\\4-2(1-x)=8:4\\4-2(1-x)=2\\2(1-x)=4-2\\2(1-x)=2\\ 1-x=2:2\\1-x=1\\ x=1-1\\ x=0\)
Tìm x biết :
x + 12 = 23
34 - x = 32
x - 56 = 45
Ai tick mình mình tick lại
x+12=23
x =23-12
x =11
34-x=32
x=34-32
x=2
x-56=45
x =45+56
x =101
x+12=23
x=11
34-x=32
x=2
x-56=45
x=101
bài 1 tính
a, 24 x 66 - 24 + 36 x 24
b, 29 x 173 - 29 x 72 -29
c, 1+5+10+15+...+55+60
d, 1x2+2x3+3x4 +...+18x19+19x20
bài 2 tìm x
a,106- ( x+ 7) =9
b, 2 x ( x+ 4) + 5 =65
c, (16x x -32) x 45=0
d, x+4 x x = 100 : 5
bài 2 tìm x
a,106- ( x+ 7) =9
x+7 = 106 - 9
x+7 = 107
x= 107 - 7
x=100
b, 2 x ( x+ 4) + 5 =65
2 x (x+4) = 65 - 5
2 x (x+4) = 60
x+4 = 60:2
x+4= 30
x= 30 - 4
x=26
c, (16x x -32) x 45=0
16 x X - 32 = 0: 45
16 x X - 32 =0
16 x X = 0 + 32
16 x X = 32
X= 32:16
X=2
d, x+4 x x = 100 : 5
X + 4 x X = 20
(1+4) x X = 20
5 x X = 20
X= 20:5
X=4
Bài 1:
a, 24 x 66 - 24 + 36 x 24
= 24 x (66-1+36)
= 24 x 101
= 24 x 100 + 24
= 2400+24
=2424
b, 29 x 173 - 29 x 72 - 29
= 29 x (173 - 72 -1)
= 29 x 100
= 2900
c, 1+5+10+15+...+55+60
= (5+60) x 6 + 1 (có 6 cặp)
= 65 x 6 + 1
= 390 +1 =391
d, D= 1 x 2 + 2 x 3 + 3 x 4 +...+18 x 19 + 19 x 20
3D= 1 x 2 x 3+ 2 x 3 x (4-1) + 3 x 4 x (5-2) +...+ 18 x 19 x (20 - 17) + 19 x 20 x (21-18)
3D= 1 x 2 x 3 - 1 x 2 x 3 + 2 x 3 x 4 - 2 x 3 x 4 +.... + 19 x 20 x 21 - 18 x 19 x 20
3D= 19 x 20 x 21 =7980
=> D= 7980:3=2660
Tìm x
x - 5 6 = 2 3
x × 2 3 = 7 3