a) 2x - 15 = 17
2x = 25
b) ( 7x - 11 )3 = 25. 52 + 200
(7x - 11)3 = 32 . 25 + 200
(7x -11)3 = 1000
(7x-11)3 = 103
7x - 11 = 10
7x = 10+11
7x = 21
x = 21 : 7
x = 3
like nha
tìm x:
a) \(2^x-15=17\)
b) \(\left(7x-11\right)^3=2^5.5^2+200\)
c) \(x^{10}=1^x\)
d) \(x^{10}=x\)
e) \(\left(2x-15\right)^5=\left(2x-15\right)^3\)
Hết~
A=\(\dfrac{3^{10}.11+3^{10}.5}{3^9.2^4}\)
B=\(\dfrac{2^{10}.13+2^{10}.65}{2^8.104}\)
C=\(\dfrac{72^3.54^2}{108^4}\)
D=\(\dfrac{11.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right)^2}\)
1.tính c = \(\left(1\cdot2\cdot3\cdot4+2\cdot3\cdot4\cdot5+...+18\cdot19\cdot20\cdot21\right)-5-10-15-...-200\)
2. tính d = \(\dfrac{1}{1\cdot2\cdot3}+\dfrac{1}{2\cdot3\cdot4}+...+\dfrac{1}{18\cdot19\cdot20}-\dfrac{3}{1\cdot2}-\dfrac{3}{2\cdot3}-...-\dfrac{3}{19\cdot20}\)
3.tìm x: \(2\left(x-3\right)-3\left(1-2x\right)=4+4\left(1-x\right)\)
4.tìm x: \(\dfrac{x-2}{2}-\dfrac{1+x}{3}=\dfrac{4-3x}{4}-1\)
giải nhanh giùm tớ nhé. ghi cả lời giả ra kìa
a) \(\dfrac{45^3.20^4.18^2}{180^5}\)
b)\(\dfrac{4^9.3^6+64^4}{16^4.100}\)
Bài 2: Tìm x
a)\(\left(2x+1\right)^3=27\)
b)\(3^{2x+1}.11=297\)
c)\(\left(7x-11\right)^3=2^5.5^2+200\)
d)\(\left(x-5\right)^4=\left(x-5\right)^6\)
Ngày mai đi học rùi, cần lắm
Tìm x,y nguyên
a)\(10^x+y^2=5042\)
b) \(x^2y-x+xy=6\)
c) \(\left|x-2\right|=\left|2x+5\right|\)
d) \(\left|x-3\right|=2x+4\)
e) \(x+2\ge1\)
f) \(12\le\left|x+1\right|\le15\)
Viết các tích sau dưới dạng lũy thừa :
a) \(3^5.5^7.45\)
b) \(2^8.4^5.9^9\)
c) \(\left(2^3.3^5.5^7\right)^{10}.12^{20}\)
d) \(\left(x^2.y\right)^5.\left(x^2.y^2\right)^7.\left(x.y^2\right)^6.x^3\)
e) \(18^{20}.45^5.5^{25}.8^{10}\)
f) \(2^7.3^8.4^9.9^8\)
CÁC BN GIÚP MK VS !
Tim x \(\in\) N
a)\(^{3^{x-2}}\)
b)\(3.4^{x-2}\)=19.2
c)\(5^{x+1}+5^{x+2}\)=810
d)\(\left(x-1\right)^5-\left(x-1\right)^2=0\)
e)\(2^x-15=17\)
Cac ban oi cac ban lam giup minh voi mai minh phai nop bai roi
\(\left(3-x\right)^6=\left(3-x\right)^4\) \(\left(3^2\right)^2+2^x=5\left(5+2^2.3\right)\) \(5^{x-1}+5^x=150\)
tim x thuoc N
a,\(21x-1⋮11\)
b,\(5x+1⋮7\) va x la STN lon nhat co 3 chu so
c,\(3x-2⋮11\) va \(100< x< 2017\)
d,\(5⋮\left(x-3\right)\)
e,\(\left(3x+2\right)⋮\left(x+1\right)\)