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a) \(\left(2+x\right):5=6\)
\(2+x=6\times5\)
\(2+x=30\)
\(x=30-2\)
\(x=28\)
b) \(\left(3\times x+15\right)-75=0\)
\(3\times x+15=0+75\)
\(3\times x+15=75\)
\(3\times x=75-15\)
\(3\times x=60\)
\(x=60:3\)
\(x=20\)
x - ( 48 - 24 x 2 : 6 - 3 ) = 0
x = 48 - 24 x 2 : 6 - 3
x = 48 - 48 : 6 - 3
x = 48 - 8 - 3
x = 40 - 3
x = 37
Vậy x = 37
Tham khảo nha !!!
\(a,\left(x-12\right)\times1000=0\)
\(x-12=0\)
\(x=0+12\)
\(x=12\)
\(b,\left(23-x\right)\times34=34\)
\(23-x=34:34\)
\(23-x=1\)
\(x=23-1\)
\(x=22\)
\(c,\left(x-5\right)\times6=24\)
\(x-5=24:6\)
\(x-5=4\)
\(x=4+5\)
\(x=9\)
\(d,2x+3=15\)
\(2x=15-3\)
\(2x=12\)
\(x=12:2\)
\(x=6\)
\(e,6\left(7x+1\right)=48\)
\(7x+1=48:6\)
\(7x+1=8\)
\(7x=7\)
\(x=1\)
\(g,\left(x-6\right)\left(x-34\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-6=0\\x-34=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=6\\x=34\end{cases}}\)
\(h,\left(x-4\right)\left(x+2\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-4=0\\x+2=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=4\\x=-2\end{cases}}\)
Bài làm
a) \(\left(x-12\right).1000=0\)
Vì 1000 > 0 \(\Rightarrow x-12=0\Rightarrow x=12\)
b) \(\left(23-x\right).34=34\)
\(\Rightarrow23-x=1\Rightarrow x=22\)
c) \(\left(x-5\right).6=24\Rightarrow x-5=4\Rightarrow x=9\)
d) \(2x+3=15\Rightarrow2x=12\Rightarrow x=6\)
e) \(6\left(7x+1\right)=48\Rightarrow7x+1=8\)
\(\Rightarrow7x=7\Rightarrow x=1\)
g) \(\left(x-6\right).\left(x-34\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-6=0\\x-34=0\end{cases}\Rightarrow\orbr{\begin{cases}x=6\\x=34\end{cases}}}\)
Vậy x= 6 hoặc x= 34
h)\(\left(x-4\right).\left(x+2\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-4=0\\x+2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=4\\x=-2\end{cases}}}\)
Vậy x=4 hoặc x= -2
i) \(x\left(x+1\right).\left(x+2\right)=3\)
..........
Cậu có thể tam khảo bài làm trên đây ạ, học tốt nha ^^
a) \(6x+15\times8=12\times\left(19-x\right)\)
\(6x+120=228-12x\)
\(6x+120-228+12x=0\)
\(18x-108=0\)
\(18x=108\)
\(x=6\)
b) \(160-\left(35\div x+3\right)\times15=15\)
\(160-\left(35\div x+3\right)=1\)
\(35\div x+3=159\)
\(35\div x=156\)
\(x=\dfrac{35}{156}\)
c) \(2x-\left(1309\div11-19\right)-2=0\)
\(2x-1309\div11-19=2\)
\(2x-119-19=2\)
\(2x-119=21\)
\(2x=140\)
\(x=70\)
d) \(\left(x-7\right)\times\left(2x-16\right)=0\)
\(x-7=0;2x-16=0\)
\(x=7;2x=16\)
\(x=7;x=8\)
x - 6:2-(48-24):2:6+3 = 0
x- 3 - 24 :2:6+3=0
x-3-2+3 = 0
x-3-2 = 0+3
x-3-2=3
x-3=3+2
x-3=5
x=5+3
x=8
x - 6 : 2 - ( 48 - 24 ) : 2 : 6 + 3 = 0
x - 6 : 2 - 24 : 2 : 6 + 3 = 0
x - 3 - 12 : 6 + 3 = 0
x - 3 - 2 + 3 = 0
x - 3 - 2 =0-3
x - 3 - 2 =-3
x - 3=-3+2
x - 3=-1
x=-1+3
x=2
112-12 .(x+1) =40
112 - 12x - 12 = 40
-12x = 40-100
12x = 60
x=5
(3x-6).2=0
=>3(x-2)=0
=>x-2 = 0 => x= 2
112-12.(x+1) =40 (3.x-6).2=0
12.(x-1) =112-40 (3.x-6)=0.2
12.(x-1)=72 (3.x-6)=0
(x-1)=72:12 3.x=0+6
(x-1)=6 3.x=6
x=6+1 x=6:3
x=7 x=3
a) \(3\left(2-x\right)+5\left(x-6\right)=98\)
\(\Rightarrow6-3x+5x-30=98\)
\(\Rightarrow\left(6-30\right)+\left(-3x+5x\right)=98\)
\(\Rightarrow-24+2x=98\)
\(\Rightarrow2x=98-\left(-24\right)\)
\(\Rightarrow2x=122\)
\(\Rightarrow x=122:2\)
\(\Rightarrow x=61\)
Vậy x = 61
b) \(3x-2=2x-3\)
\(\Rightarrow3x-2x=2-3\)
\(\Rightarrow x=-1\)
Vậy x = -1
c) \(\left(x-7\right)\left(x^3-8\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-7=0\\x^3-8=0\end{cases}}\Rightarrow\orbr{\begin{cases}x-7=0\\x^3=8\end{cases}}\Rightarrow\orbr{\begin{cases}x=7\\x=2\end{cases}}\)
Vậy x = 7 hoặc x = 2
_Chúc bạn học tốt_
a.6-3X+5X-30=98
2X-24=98
2X=74
X=37
b.3X-2X=2-3
X=-1
c.X-7=0 X=7
X^3-8=0 X=2
\(x+3 \times(x-6)=0\)
\(x+3 \times x-18=0\)
\(4\times x=18\)
\(x=18:4\)
\(x=\dfrac{9}{2}\)
x+3×(x−6)=0
x+3 \times x-18=0x+3×x−18=0
4\times x=184×x=18
x=18:4x=18:4
x=\dfrac{9}{2}x=29