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a)
204-84:12
=204-7
=197
b)
15.23+4.32-5.7
=15.8+4.9-5.7
=120+36-35
=156-35
=121
c)
56:53+23.22
=56-3+23+2
=53+25
=125+32
=157
d)
164.53+47.164
=(164.(53+47)
=164.100
=16400
tìm x:
219-7(x+1)=100
=>7(x+1)=219-100
=>7(x+1)=119
=>x+1=119:7
=>x+1=17
=>x=17-1
=>x=16
(3x-6).3=34
=>(3x-6).3=81
=>3x-6=81:3
=>3x-6=27
=>3x=27+6
=>3x=33
=>x=33:3
=>x=11
Bài 2:a)<=>5(x+4) =125-38
<=>5(x+4)=87
<=>x+4=17,4
<=>x=17,4-4=13.4
b)<=> ( 3x – 24) . 73 = 2.74
<=> (3x – 16) = 2.74 : 73
<=> (3x – 16) =2.7
<=>3x – 16 = 14
<=> 3x = 30
<=> x = 10
c)=> xϵ ƯC (70, 84) và x > 8
Ta có: 70 = 2. 5. 7 => ƯCLN( 70,84) = 2. 7 = 14
84 = 22. 3. 7
=> ƯC (70, 84) = Ư(14) = { 1 ;2; 7; 14 }
Vì x > 8 => x = 14
d)=>xϵ BCNN (12, 25, 30) và 0 < x < 500
=>BC(12,25,30)=B(300) = { 0; 300; 600; …}
Vì 0 < x < 500
=> x = 300
giup minh nha cac ban . lam duoc minh se tick cho va ket ban . cam on cac ban
a,\(\left(x-2\right)^2=\left(x-2\right)^4\)
\(\Rightarrow\left(x-2\right)^2-\left(x-2\right)^4=0\)
\(\Rightarrow\left(x-2\right)^2\left[1-\left(x-2\right)^2\right]=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\\left(x-2\right)^2=1\end{cases}}\)
Vậy x = 2 hoặc x = 3 hoặc x = 1
\(b,\)\(\left(x-1\right)^3=46:8\)
\(\Rightarrow\left(x-1\right)^3=2^3\)
\(\Rightarrow x-1=2\Leftrightarrow x=3\)
\(c,x^{30}=x\)
\(\Rightarrow x^{30}-x=0\)
\(\Rightarrow x\left(x^{29}-1\right)=0\)
\(\Rightarrow x=\orbr{\begin{cases}0\\1\end{cases}}\)
\(d,\left(2x+1\right)^7=9^8:3^2=3^{16}:3^2=3^{14}=9^7\)
\(\Rightarrow2x+1=9\)
\(\Rightarrow x=4\)
a) (x-7).82=84
(x-7)=84:82
(x-7)=82
(x-7)=64
x=64+7=71
b)128-3.(x+4)=23
3.(x+4)=128-23
3.(x+4)=105
(x+4)=105:3
(x+4)=35
x=35-4=11
b)53.(12+172-84)=53.100=5300
\(27+\left(220-6x\right).3=615\)
\(\rightarrow\left(220-6x\right).3=615-27=588\)
\(\rightarrow220-6x=588:3=196\)
\(\rightarrow6x=220-196=24\)
\(\rightarrow x=24:6=4\)
\(315-\left(x-3\right).7=210\)
\(\Rightarrow\left(x-3\right).7=315-210=105\)
\(\Rightarrow x-3=105:7=15\)
\(\Rightarrow x=15+3=18\)
a, 23x - 503 = 32. 23
23x - 503 = 72
23x = 72 + 503
23x = 575
x = 575 : 23
x = 25
Vậy x = 25
b, 38747 - (10425 + x) = 3828 : 12
38747 - (10425 + x) = 319
10425 + x = 38747 - 319
10425 + x = 38428
x = 38428 - 10425
x = 28003
Vậy x = 28003
c, 84 - 6 (x+4) = 48
6. (x+4) = 84 - 48
6. (x+4) = 36
x + 4 = 36 : 6
x + 4 = 6
x = 6 - 4
x = 2
Vậy x = 2
a) x=25
b) x=28003
c) x=2