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\(a,18.\left(x-16\right)=18\)
\(x-16=18:18\)
\(x-16=1\)
\(x=16+1\)
\(x=17\)
\(b,45.\left(11-x\right)=45\)
\(11-x=45:45\)
\(11-x=1\)
\(x=11-1\)
\(x=10\)
\(18.\left(x-16\right)=18\)
\(=>x-16=1\)
\(=>x=17\)
\(45\left(11-x\right)=45\)
\(=>11-x=1\)
\(=>x=10\)
Ủng hộ mik nha
Thanks
a) 27 - 3(x - 3) = 6
=> 3(x - 3) = 27 - 6
=> 3(x - 3) = 21
=> x - 3 = 21 : 3
=> x - 3 = 7
=> x = 7 + 3
=> x = 10
b) (x - 38) : 16 = 12
=> x - 38 = 12 . 16
=> x - 38 = 192
=> x = 192 + 38
=> x = 230
c) (6x - 18) : 3 + 25 x 2 = 78
=> (6x - 18) : 3 + 50 = 78
=> (6x - 18) : 3 = 78 - 50
=> (6x - 18) : 3 = 28
=> 6x - 18 = 28 . 3
=> 6x - 18 = 84
=> 6x = 84 + 18
=> 6x = 102
=> x = 102 : 6
=> x = 17
a) \(27-3\left(x-3\right)=6\)
\(\Rightarrow3\left(x-3\right)=27-6\)
\(\Rightarrow3\left(x-3\right)=21\)
\(\Rightarrow x-3=21:3\)
\(\Rightarrow x-3=7\)
\(\Rightarrow x=7+3=10\)
Mà x \(\inℕ\Rightarrow x=10\)
Vậy x = 10
b) \(\left(x-38\right):16=12\)
\(\Rightarrow x-38=12.16\)
\(\Rightarrow x-38=192\)
\(\Rightarrow x=192+38=230\)
Mà x \(\inℕ\Rightarrow x=230\)
Vậy x = 230
c) \(\left(6x-18\right):3+25.2=78\)
\(\Rightarrow\left(6x-18\right):3+50=78\)
\(\Rightarrow\left(6x-18\right):3=78-50=28\)
\(\Rightarrow6x-18=28.3=84\)
\(\Rightarrow6x=84+18=102\)
\(\Rightarrow x=102:6=17\)
Mà x \(\inℕ\Rightarrow x=17\)
Vậy x = 18
P/s: Dấu "." là dấu nhân nhé em
\(1+3+5+......+x=2500\)
\(\Rightarrow\left[\left(x-1\right):2+1\right].\left(x+1\right):2=2500\)
\(\Rightarrow\left(\frac{x}{2}-\frac{1}{2}+1\right).\left(x+1\right)=2500.2\)
\(\Rightarrow\left(\frac{x}{2}+\frac{1}{2}\right).\left(x+1\right)=5000\)
\(\Rightarrow\frac{x^2}{2}+\frac{1}{2}x+\frac{x}{2}+\frac{3}{2}=5000\)
\(\Rightarrow\frac{x^2+x+x+3}{2}=5000\)
\(\Rightarrow x^2+2x+3=5000.2\)
\(\Rightarrow x^2+2x.1+1^2+3-1^2=10000\)
\(\Rightarrow\left(x+1\right)^2+2=10000\)
\(\Rightarrow\left(x+1\right)^2=10000-2\)
\(\Rightarrow\left(x+1\right)^2=9998\)
\(\Rightarrow x+1=\sqrt{9998}\)
\(\Rightarrow x=\sqrt{9998}-1\)
( x - 6 )( x + 1 ) = 0
<=> x - 6 = 0 hoặc x + 1 = 0
<=> x = 6 hoặc x = -1
18 . ( x-16 ) = 18
x-16 = 18 : 18
x- 16 = 1
x= 16+1
x= 17
18 (x - 16) = 18
18 (x - 16) = 18 . 1
Vì 18 = 18
=> x - 16 = 1
=> x = 17
Vậy x = 17.