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b) (x + 15) - 51 = 72.24-1
(x + 15) - 51 = 49.16-1
(x + 15) - 51 = 784 - 1
(x + 15) - 51 = 783
(x + 15) = 783 + 51
x + 15 = 834
x = 834 - 15
x = 819
Vậy x = 819
c) 3125 - 25.(x + 40) = 1717
3125 - 32.(x + 40) = 1717
- 32.(x + 40) = 1717 - 3125
- 32.(x + 40) = -1408
x + 40 = -1408 : (-32)
x + 40 = 44
x = 44 - 40
x = 4
Vậy x = 4
d) 16 - x : 4 = 14
- x : 4 = 14 - 16
- x : 4 = -2
- x = -2.4
- x = -8
x = 8
Vậy x = 8
a) 72 - 23 . x = 0
\(\Rightarrow2^3.x=72\)
\(\Rightarrow8.x=72\)
\(\Rightarrow x=72:8=9\)
a) \(\text{2(x-51)=2.2^2+20}\)
\(2\left(x-51\right)=2.4+20\)
\(2\left(x-51\right)=28\)
\(x-51=28\div2\)
\(x-51=14\)
\(x=14+51\)
\(\text{b)3.(x+1)-26=541}\)
\(3.\left(x+1\right)=541+26\)
\(3\cdot\left(x+1\right)=567\)
\(x+1=567\div3\)
\(x+1=189\)
\(x=189-1\)
\(x=188\)
\(x=65\)
\(\text{c)4(x-3)=7^2-1^10}\)
\(4\left(x-3\right)=49-1\)
\(4\left(x-3\right)=48\)
\(x-3=48\div4\)
\(x-3=12\)
\(x=12+3\)
\(x=15\)
\(\text{e)2x-138=2^3.3^2}\)
\(2x-138=8\cdot9\)
\(2x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=210\div2\)
\(x=105\)
\(\text{f)(x-1)^4=16}\)
\(\left(x-1\right)^4=2^4\)
\(x-1=2\)
\(x=2+1\)
\(x=3\)
bài 1
a)
=> 3(x-2)=60-51
=> 3(x-2) =9
=> x-2 =9:3
=> x-2 =3
=> x =3+2
=> x =5
b)
=>4x-20=25-2
=>4x-20=23
=>4x-20=8
=>4x=8+20
=>4x=28
=>x=28:4
=>x=7
c)
=> 25+x.5-64=251
=> x.5-64 =251-25
=> x.5-64 =226
=> x.5 =226+64
=> x.5 =290
=> x =290:5
=> x =58
d)
=> [(14)2 - (12)2].2x=1872
=> 52.2x =1872
=> 104x =1872
=> x = 1872:104
=> x=18
e)
x10=x
=> x10-x=0
=>x(x9-1)=0
=>\(\orbr{\begin{cases}x=0\\x^9-1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x^9=1\Rightarrow x=1\end{cases}}}\)
nha
mình sẽ làm típ
T I C K cho mình mình sẽ làm típ
a, 72 - 23.x=0
<=> 8x=72
<=> x=9
b, ( x + 15 ) -51 = 72 . 24 - 1
<=> x + 15 -51 = 784 - 1
<=> x-36=783
<=> x=819
c, 3125 - 25(x+40)=1717
<=> 32(x+40)=1408
<=> x+40=44
<=> x=4
d, 16 - x:4=14
<=>x:4=2
<=>x=8
\(a,72-2^3.x=0\)
\(2^3.x=72\)
\(x=72:8\)
\(x=9\)