1/10 - {[(X :3+17):10+3.24=5
2/[(6x-39):3].28=2538
1)6+3x+2=87
2)[(8x-12):4].33=36
3)[(6x-39):3].28=2538
4)2x+10=18
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4) 2x + 10 = 18
2x = 18 - 10
2x = 8
x = 8 : 2
x = 4
1)\(6+3^{x+2}=87\)
\(\Rightarrow\)\(3^{x+2}=87-6\)
\(\Rightarrow3^{x+2}=81\)
\(\Rightarrow3^x.3^2=81\)
\(\Rightarrow3^x=81\div3^2\)
\(\Rightarrow3^x=9\)
\(\Rightarrow x=2\)
\(v\text{ậy}\)\(x=2\)
10-{[(x:3+17):10+3.24]:10}=5
10-{[(x:3+17):10+3.24]:10}=5
a: Ta có: 10−{[(x:3+17):10+3·24]:10}=5
⇔[(x:3+17):10+48]:10=5
⇔(x:3+17):10+48=50
⇔(x:3+17):10=2
⇔x:3+17=20
⇔x:3=3
\(\Leftrightarrow\) X=3.3
\(\Leftrightarrow\) X= 9
Vậy x= 9
Hoktot~
a) 10-{[(x:3+17):10+3.24 ]:10}=5
b) 2448:[119-(x-6)]=24
c)165-(35:x+3).19=13
a: Ta có: \(10-\left\{\left[\left(x:3+17\right):10+3\cdot2^4\right]:10\right\}=5\)
\(\Leftrightarrow\left[\left(x:3+17\right):10+48\right]:10=5\)
\(\Leftrightarrow\left(x:3+17\right):10+48=50\)
\(\Leftrightarrow\left(x:3+17\right):10=2\)
\(\Leftrightarrow x:3+17=20\)
\(\Leftrightarrow x:3=3\)
hay x=9
b: Ta có: \(2448:\left[119-\left(x-6\right)\right]=24\)
\(\Leftrightarrow119-\left(x-6\right)=102\)
\(\Leftrightarrow x-6=17\)
hay x=23
c: Ta có: \(165-\left(35:x+3\right)\cdot19=13\)
\(\Leftrightarrow\left(35:x+3\right)\cdot19=152\)
\(\Leftrightarrow\left(35:x+3\right)=8\)
\(\Leftrightarrow35:x=5\)
hay x=7
Bài 1: Tìm số tự nhiên x, biết:
a,36 : [ 7(x - 3) + 4 ] = 24 :23
b,[(6x - 39) : 3 ] . 28 = 5628
c,(2x -7) - (x + 135)=0
d,24 .125 + 52 . 25
e,17 . 27 +17 . 25 + 17 . 48
g,122 + (37 - 3x) = 0
h,(14 - 3x) + (6+x) = 0
[(6x-39):3].28=2538
(3+32+33+34+35+36+...+399+3100) chia hết cho 4.
259x chia hết cho 2&3
[(6x-39):3].28=2538
cần dùng bao nhiêu chữ số để đánh số trang quyển sách dày 5555 trang?
(3+32+33+34+35+36+...+399+3100) chia hết cho 4
1) [(x+32)-17].2=42
2) 44=7.x=103:10
3) 128-3(x+4)=23
4) (6x-33).53=3.54
5) [(6x-72):2-84].28=5628
6) 2448:[119-(x-6)]=24
a, 3(x-6)-11=22
b, 4x-10-10=20
c,5(x+2)+8=23
d,720:(x-17)=12
e,(x-28):12=8
f,26+8x=6x+46
\(a,3\left(x-6\right)-11=22\)
\(\Rightarrow3\left(x-6\right)=22+11=33\)
\(\Rightarrow x-6=33:3=11\)
\(\Rightarrow x=11+6=17\)
\(b,4x-10-10=20\)
\(\Rightarrow4x=20+10+10=40\)
\(\Rightarrow x=40:4=10\)
\(c,5\left(x+2\right)+8=23\)
\(\Rightarrow5\left(x+2\right)=23-8=15\)
\(\Rightarrow x+2=15:5=3\)
\(\Rightarrow x=3-2=1\)