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\(\text{a/96-3(x+1)=42}\)
\(3\left(x+1\right)=54\)
\(x+1=54:3\)
\(x+1=18\)
\(\Rightarrow x=17\)
\(\text{b/2.x-18=20}\)
\(2x=38\)
\(x=38:2\)
\(x=19\)
\(\text{c/134-5.(x+4)=34}\)
\(5\left(x+4\right)=100\)
\(x+4=100:5\)
\(x+4=20\)
\(\Rightarrow x=16\)
học tốt
a) 96-3(x+1)=42
3(x+1)=96-42
3(x+1)=54
x+1=54:3
x+1=18
x=18-1
Vậy x=17
b) 2x-18=20
2x=20+18
2x=38
x=38:2
x=19
Vậy x=19.
c) 134-5(x+4)=34
5(x+4)=134-34
5(x+4)=100
x+4=100:5
x+4=20
x=20-4
x=16
Vậy x=16.
a) 96-3(x+1)=42
3(x+1)=96-42
3(x+1)=54
x+1=54:3
x+1=18
x=18-1
x=17
Vậy x=17
b)2.x-18=20
2.x =20+18
2.x =38
x =38:2
x =19
Vậy x=19
c)134-5.(x+4)=34
5.(x+4)=134-34
5.(x+4)=100
x+4 =100:5
x+4 =20
x =20-4
x =16
Vậy x=16
\(\left(x-13\right).25=0\)
\(x-13=0\)
\(x=13\)
Vậy \(x=13\)
2x-5=x+5
2x=x+5+5
2x-x=10
x=10
Vậy x= 10
Chúc bạn học tốt ~
a, ( x - 13) * 25 = 0
x - 13 = 0:25
x - 13 + 0
x = 0 + 13
x = 13
\(a)9.4.25.8.125\)
\(=9.\left(4.25\right).\left(8.125\right)\)
\(=9.100.1000\)
\(=900.1000\)
\(=900000\)
\(a,9.4.25.8.125=9.\left(4.25\right).\left(8.125\right)=9.100.1000=900000\)
\(b,25.5.27.2\)(câu này hình như thiếu đề, ko tính nhanh đc)
\(c,37.7+80.3+43.7\)\(=7.\left(37+43\right)+80.3\)\(=7.80+3.80=80\left(7+3\right)=80.10=800\)
\(d,113.38+113.62+87.62+87.38\)\(=113\left(38+62\right)+87\left(62+38\right)\)
\(=113.100+87.100=100.\left(113+87\right)=100.200=20000\)
Viết gọn lũy thừa:
\(a,x.x.y.y.x.y.x=\left(x.x.x.x\right).\left(y.y.y\right)=x^4.y^4\)
\(b,7^5:343=7^5:7^3=7^{5-3}=7^2\)
\(c,A^{12}:A^{18}=A^{12-18}=A^{-6}\)
\(d,x^7.x^4.x=x^{7+4+1}=x^{12}\)
5^x . 5^x+1 . 5 ^x+2 <100...0:2^18 <=>5^3x+3 <10^18:2^18= (10:2)^18 =5^18 <=>3x +3 <18 <=>3x<15 <=>x<5 <=>x=0,1,2,3,4 k nha ok thank
bài 4 tìm X biết
a)(X-36):18=12
X-36= 12*18
X-36= 216
X= 216 + 36
X= 252
b)5X-3-2 . 52 =52 . 3
5X-3 = 52 . 3 + 2 . 52
5X-3 = 52 . ( 3+2)
5X-3 = 52 . 5
5X-3 = 52 . 5\(^1\)
5X-3 = 5\(^3\)
=> X-3=3
X= 3+3
X=6
c)X . (X - 3)=0
\(\rightarrow\) \(\orbr{\begin{cases}x=0\\x-3=0\end{cases}}\)
\(\rightarrow\orbr{\begin{cases}x=0\\x=3\end{cases}}\)
D)3X+1-32=2 .32
3X+1 = 2 .32 + 32
3X+1 = 2 .32 + 32 .1
3X+1 = 32 . ( 2+1)
3X+1 = 32 .3
3X+1 = 32 .3\(^1\)
3X+1 = 3\(^3\)
=> X+1= 3
X= 3+1
X= 4
\(1.x^2+11x=0\)
\(\Leftrightarrow x\left(x+11\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x+11=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x=-11\end{cases}}\)
\(2.\left(x^2-1\right)\left(x^2-9\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(x-1\right)\left(x+9\right)\left(x-9\right)=0\)
chia thành 4 TH :
\(TH1:X-1=0\)
\(\Leftrightarrow x=1\)
\(TH2:x+1=0\)
\(\Leftrightarrow x=-1\)
\(TH3:X+9=0\)
\(\Leftrightarrow X=-9\)
\(TH4:x-9=0\)
\(\Leftrightarrow x=9\)
Kết luận ....
\(3.\left(\left|x+1\right|-5\right)\left(x^2-9\right)\)
\(\Leftrightarrow\left(\left|x+1\right|-5\right)\left(x-3\right)\left(x+3\right)=0\)
\(\Leftrightarrow\hept{\begin{cases}\left|x+1\right|-5=0\\x-3=0\\x+3=0\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}\left|x+1\right|=5\\x=3\\x=-3\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x+1=+_-5\Leftrightarrow x+1=5,x+1=-5\Leftrightarrow x=4,x=-6\\x=3x\\x=-3\end{cases}}\)
kết luận x=.....
\(4.\left(3x-16\right)⋮\left(x+2\right)\)
\(\Leftrightarrow\left(3x+6\right)-22\)
\(\Leftrightarrow3\left(x+2\right)-22⋮\left(x+2\right)\)
Vì\(\left(x+2\right)⋮\left(x+2\right)\)
\(\Rightarrow\left(3x-16\right)⋮\left(x+2\right)\)
Kết luận x=.....
\(\frac{1}{2}x+\frac{2}{4}x=-\frac{18}{25}.\)
\(\Leftrightarrow\frac{1}{2}x+\frac{1}{2}x=-\frac{18}{25}\)
\(\Leftrightarrow\left(\frac{1}{2}+\frac{1}{2}\right)x=-\frac{18}{25}\)
\(\Leftrightarrow x=-\frac{18}{25}\)