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a)4.(x+3)-(2x-12)=x-(-11+4)
4x+12-2x+12=x+11-4
2x+24=x+7
2x-x=-24+7
x=-17
b)-(4x-13)+(5x-4)=-3-(-15+7)
-4x+13+5x-4=-3+15-7
(-4x+5x)+13-4=12-7
x+9=5
x=-4
c)(5x-3)-(-2x+4)=6x-12
5x-3+2x-4=6x-12
5x+2x-6x=3+4-12
x=-5
d)(15x+20)-(9x-3)=5x-(-12)
15x+20-9x+3=5x+12
15x-9x-5x=-20-3+12
x=-11
e,(7x+14)+(3x-8)=-(-9x+3)
7x+14+3x-8=9x-3
7x+3x-9x=-14+8-3
x=-9
a) 12-3x=0
3x=12-0
3x=12
x=12:3
x=4
b)2x-26=25.12
2x-26=300
2x=300+26
2x=326
x=326:2
x=163
c)5x+28=234:3
5x+28=78
5x=78-28
5x=50
x=50:5
x=10
d)72-7x=529:23
72-7x=23
7x=72-23
7x=49
x=49:7
x=7
k cho mình nhoa~~
a, (12-3x):20=0
=> 12-3x=0
=> 3x=12
=> x= 4 Vậy x=4
b, (2x-26):12=25
=> 2x-26=300
=> 2x=326
=> x=163 Vậy x= 163
c, 234:( 5x+28)=3
=> 5x+28=78
=> 5x=50
=> x= 10 Vậy x= 10
d, 529: (72-7x)=23
=> 72-7x=23
=> 7x=49
=> x= 7 Vậy x= 7
Nhớ k cho mik nhé!!!! CẢM ƠN !!!
1. -86 + ( -14)
= -86 - 14
= -100
2. 123 + ( -36)
= 123 - 36
= 87
3. ( -44) - ( -66)
= -44 + 66
= 22
4. -82 + (-28)
= -82 - 28
= -110
5. 83 + ( -17)
= 83 - 17
= 66
Các bài khác làm tương tự nha bạn
1/ (-86)+(-14)=-86-14=-100
2/123+(-36)=123-36=87
3/(-44)-(-66)=-44+66=22
4/-82+(-28)=-82-28=-110
5/83+(-17)=83-17=66
6/(-83)-33=(-83)+(-33)=-116
7/ 73+(-24)=73-24=49
8/84+(-48)=84-48=36
9/-72-82=-72+(-82)=-154
10/-97-82=-97+(-82)=-179
11/19+(-92)=19-92=-73
12/38-28=10
13/13+(-27)=13-27=-14
14/-85+29=-85-(-29)=-114
15/-84-(-27)=-84+27=-57
16/-23+78=-23-(-78)=-101
17/93+(-29)=93-29=64
18/-74-83=-74+(-83)=-157
19/-183+83=-183-(-83)=-266
20/849-(-3832)=849+3832=4681
Có gì sai mong bạn sửa giúp mình nhé!
a: \(4x^3+12=120\)
=>\(4x^3=108\)
=>\(x^3=27=3^3\)
=>x=3
b: \(\left(x-4\right)^2=64\)
=>\(\left[{}\begin{matrix}x-4=8\\x-4=-8\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=12\\x=-4\end{matrix}\right.\)
c: (x+1)^3-2=5^2
=>\(\left(x+1\right)^3=25+2=27\)
=>x+1=3
=>x=2
d: 136-(x+5)^2=100
=>(x+5)^2=36
=>\(\left[{}\begin{matrix}x+5=6\\x+5=-6\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1\\x=-11\end{matrix}\right.\)
e: \(4^x=16\)
=>\(4^x=4^2\)
=>x=2
f: \(7^x\cdot3-147=0\)
=>\(3\cdot7^x=147\)
=>\(7^x=49\)
=>x=2
g: \(2^{x+3}-15=17\)
=>\(2^{x+3}=32\)
=>x+3=5
=>x=2
h: \(5^{2x-4}\cdot4=10^2\)
=>\(5^{2x-4}=\dfrac{100}{4}=25\)
=>2x-4=2
=>2x=6
=>x=3
i: (32-4x)(7-x)=0
=>(4x-32)(x-7)=0
=>4(x-8)*(x-7)=0
=>(x-8)(x-7)=0
=>\(\left[{}\begin{matrix}x-8=0\\x-7=0\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=8\\x=7\end{matrix}\right.\)
k: (8-x)(10-2x)=0
=>(x-8)(x-5)=0
=>\(\left[{}\begin{matrix}x-8=0\\x-5=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=8\\x=5\end{matrix}\right.\)
m: \(3^x+3^{x+1}=108\)
=>\(3^x+3^x\cdot3=108\)
=>\(4\cdot3^x=108\)
=>\(3^x=27\)
=>x=3
n: \(5^{x+2}+5^{x+1}=750\)
=>\(5^x\cdot25+5^x\cdot5=750\)
=>\(5^x\cdot30=750\)
=>\(5^x=25\)
=>x=2
+) 5x - 16 = 40 + x
<=> 5x - x = 16 + 40
<=> 4x = 56
<=> x = 56 : 4
<=> x= 14
+) 3x - 6 = 5x + 2
<=> 3x - 5x = 6 + 2
<=> -2x = 8
<=> x =- 4
+) x + 15 = 20 - 4x
<=> x + 4x = 20 - 15
<=> 5x = 5
<=> x= 1
+) -12 + x = 5x -20
<=> x - 5x = 12 - 20
<=> -4x = -8
<=> x= 2
i)x=4
k)x=43
l)x=11
m)x=71
tk mk nha bạn
i) ( 12- 3x ) : 20 = 0
=> 12 - 3x = 0
3x = 12
x=12 : 3 =3
k) ( 2x - 86 ) : 9999 = 0
=> 2x - 86 = 0
=> 2x = 86
=> x = 86 : 2 = 43
l) 83 : ( 5x + 28 ) = 1
5x + 28 = 83 : 1 = 83
5x = 83 - 28
5x =55
x=55 : 5 = 11
m) 98 : ( 72 - x ) = 98
72-x = 98 : 98
72 - x = 1
x = 72 - 1 = 71