Đại số lớp 7
Các câu hỏi tương tự
Tìm x biết:
a) dfrac{-32}{left(-2right)^x}4 f) left(3x-1right)^3dfrac{-8}{27}
b) left(dfrac{1}{2}right)^{2x-1}dfrac{1}{8} g) left(2x+3right)^2dfrac{9}{121}
c) dfrac{1}{9}.27^x3^x h) 5^x+5^{x+2}650
d) 9^x:3^3dfrac{1}{243} i) left(x-7right)^{x+1}-left(x-7right)0
e) dfrac{x7}{81}27...
Đọc tiếp
Tìm x biết:
a) \(\dfrac{-32}{\left(-2\right)^x}=4\) f) \(\left(3x-1\right)^3=\dfrac{-8}{27}\)
b) \(\left(\dfrac{1}{2}\right)^{2x-1}=\dfrac{1}{8}\) g) \(\left(2x+3\right)^2=\dfrac{9}{121}\)
c) \(\dfrac{1}{9}.27^x=3^x\) h) \(5^x+5^{x+2}=650\)
d) \(9^x:3^3=\dfrac{1}{243}\) i) \(\left(x-7\right)^{x+1}-\left(x-7\right)=0\)
e) \(\dfrac{x7}{81}=27\) m) \(\left(\dfrac{-3}{4}\right)^{3x-1}=\dfrac{256}{81}\)
Tìm x biết
a) 3(1-4x).(x-1)+4(3x-2).(x+3)=-27
b) (x+3).(x2-3+9)-.(x-1).(x+1)=27
c) 2x2+3(x-1).(x+1)=5x.(x+1)
d) 8(x-1).(x+5)-(x+2).(x+5)=3(x-1).(x+2)
Câu 1. 1- (x + \(\dfrac{1}{3}\) )\(^2\) = \(\dfrac{5}{9}\)
Câu 2. 15 :( \(\dfrac{4}{9}\))\(^2\) . (\(\dfrac{8}{27}\))\(^2\) : (\(\dfrac{2}{3}\))\(^9\)
1. Tìm n, biết:
a) dfrac{-32}{left(-2right)^n}4
b) dfrac{8}{2^n}2
c) left(dfrac{1}{2}right)^{2n-1}dfrac{1}{8}
2. Tính:
a) left(dfrac{1}{2}right)^3.left(dfrac{1}{4}right)^2
b) 273: 93
c) 1252 :253
d) dfrac{27^2.8^5}{6^6.32^3}
Đọc tiếp
1. Tìm n, biết:
a) \(\dfrac{-32}{\left(-2\right)^n}=4\)
b) \(\dfrac{8}{2^n}=2\)
c) \(\left(\dfrac{1}{2}\right)^{2n-1}=\dfrac{1}{8}\)
2. Tính:
a) \(\left(\dfrac{1}{2}\right)^3.\left(\dfrac{1}{4}\right)^2\)
b) 273: 93
c) 1252 :253
d) \(\dfrac{27^2.8^5}{6^6.32^3}\)
1/Rút gọn biểu thức
a/ Bdfrac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}
b/C dfrac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}
c/Ddfrac{49^{24}.125^{10}.2^8-5^{30}.7^{49}.4^5}{5^{29}.16^2.7^{48}}
2/tìm x biết
a/9x+1-5.32x 324
b/dfrac{1}{3}.3x7.32.92-2.3x
c/dfrac{1}{5}.2x+dfrac{1}{3}.2x+1dfrac{1}{5}.27+dfrac{1}{3}.28
d/ 3x+1+2x.3x- 18x - 270
Giups mik nhanh với, mai mik đi hc rùi , bạn nào làm đc mik tick cho
Đọc tiếp
1/Rút gọn biểu thức
a/ B=\(\dfrac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}\)
b/C= \(\dfrac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)
c/D=\(\dfrac{49^{24}.125^{10}.2^8-5^{30}.7^{49}.4^5}{5^{29}.16^2.7^{48}}\)
2/tìm x biết
a/9x+1-5.32x= 324
b/\(\dfrac{1}{3}\).3x=7.32.92-2.3x
c/\(\dfrac{1}{5}\).2x+\(\dfrac{1}{3}\).2x+1=\(\dfrac{1}{5}\).27+\(\dfrac{1}{3}\).28
d/ 3x+1+2x.3x- 18x - 27=0
Giups mik nhanh với, mai mik đi hc rùi 
, bạn nào làm đc mik tick cho
9^5 x 32^4/ 3^8 x 2^10
1) \(3^x=9^{-6}.27^{-5}.81^8\) 2) \(2^x=8^3.8^{-10}.8^3\) 3) \(2^x=\dfrac{4^7}{4^3}\) MK CẦU XIN CÁC BẠN HÃY GIÚP MK !!!!!!!!!!
Tìm x
a)left(x+5right)^3-64
b)left(2x-3right)^29
c)dfrac{x}{dfrac{4}{2}}dfrac{4}{dfrac{x}{2}}
d)dfrac{-32}{left(-2right)^n}4
e)dfrac{8}{2x}4
g)left(dfrac{1}{2}right)^{2x-1}dfrac{1}{8}
h)left(dfrac{1}{2}right)^2.xleft(dfrac{1}{2}right)^5
i) left(dfrac{-1}{3}right)xdfrac{1}{81}
Đọc tiếp
Tìm x
a)\(\left(x+5\right)^3\)=-64
b)\(\left(2x-3\right)^2\)=9
c)\(\dfrac{x}{\dfrac{4}{2}}\)=\(\dfrac{4}{\dfrac{x}{2}}\)
d)\(\dfrac{-32}{\left(-2\right)^n}\)=4
e)\(\dfrac{8}{2x}=4\)
g)\(\left(\dfrac{1}{2}\right)^{2x-1}=\dfrac{1}{8}\)
h)\(\left(\dfrac{1}{2}\right)^2.x=\left(\dfrac{1}{2}\right)^5\)
i) \(\left(\dfrac{-1}{3}\right)x=\dfrac{1}{81}\)
Tìm x
1) \(\left(\dfrac{1}{16}\right)^x=\left(\dfrac{1}{8}\right)^6\) 2) \(\left(\dfrac{1}{16}\right)^x=\left(\dfrac{1}{8}\right)^{36}\) 3) \(\left(\dfrac{1}{81}\right)^x=\left(\dfrac{1}{27}\right)^4\)
4) \(\left(\dfrac{4}{9}\right)^x=\left(\dfrac{8}{27}\right)^{10}\) 5) \(2^x=4^5.4^3\) help me !!!!