\(a,2^x\cdot4=128\)
\(2^x=128\div4\)
\(2^x=32\)
\(x=5\)
\(b,x^{15}=x\Rightarrow x=1\left(0\right)\)
\(c,2^x\cdot2^3=2^4\)
\(2^x=2^{\text{4}}\div2^3\)
\(2^x=2^1\)
\(d,\left[x^5\right]^{10}=x\Rightarrow x=1\)
B2:tim so tu nhien x biet :
a)2^x.4=128
b)x^15=x
c)2^x.2^2^2=2^3^2
d)(x^5)^10=x
3 Tim x biet : a 2x*4=128 ;b x15=x; c 2x*22=23;d (x5)10=x;e (22)4/(23)=2x;f(22)4/2x=(23)3
tinh:
a. 2^4 - 50 : 25 + 13 . 7
b.32 + 5.13 - 3. 2^3
c.2. [(195 + 35 : 7) : 8 + 195 ] - 400
d.4.{3^2 . [(5^2 + 2^3 ) : 11 ] - 26} + 2011
e. 1500 - { 5^3 . 2^3 - 11 . [ 7^2 - 5.2^3 + 8 ( 11^2 - 121) ]}
tim xEN biet
a.580 : ( x - 24) = 329 - 150 : 2
b. 697 : [( 15 .x + 364) : x ] = 17
c. ( 3x - 2^4 ) . 7^3 = 2.7^4
d.(x + 1) + ( x + 4) + (x + 7) + ......+ (x + 28) = 155
tim x biet : a,-12/21×x + 3/7=-4/3, b, 2x +-3^2=5/4 , c, 75% x- 2/5=3/10, d, (3x-2)×(x+7)
tim x bit(xEN)
a) 123-5.(x-4)=38
b) 2.x-183=2^3.3^2
c)10+2.x=4^5.4^3
d)25+(177-x)=3^2.2^2.
các bạn giải giúp mình với mình cảm ơn
1) thuc hien phep tinh
a) 75-(3.52-4.23)
b)-/-12/+12-(-24)
c)17.85+15.17-120
2) tim x,biet
a)70-5.(x-3)=45
b)x-7=(-14)+(-8)
c)2./x-2/-4=6
d)128:22x-1=4
Tim x biet.
a/x+5+x-7+x-9=x-5+x-2
b/9(2x-3)+5=4(4-1)-8
c/2=-(×-1)^5+34
d/7=-|x-5|+10
tim x biet
a, /x/=12
b, 3x/x/-5=10
c, 15-2/x/=4
d, 27+4/x/=26
Tim x biet
A, 2x +23x = 625
B, (2^2+4^2) x + 2^4 ×5 ×x =100
C, (3x + 1)^2 = 6^2 + 8^2
D, (7x -11)^3 = 7^2 × 5^2 - 15^2
E, (2x- 1)^4 = 3× (3^2+4^3+2)
tim so nguyên x biet
a)2/3<x<16/3 b)3/2<x<6 c)2/5:8/15<x<25/6:35/36 d)3/5.-10/63<x<(-3)mu 2
