Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)=-4.25.-8.-125.-3
=-100.1000.-3
=300000
b)=-8.-125.25.-4.-9
=1000.-100.-9
=900000
c)=-4.-25.-9.7
=100.-63
=-6300
d) làm theo cách thường(ko chắc)
a) = \(\frac{-2}{5}\)
b) = \(\frac{-5}{4}\)
c)= \(\frac{-11}{15}\)
d) = \(\frac{3}{2}\)
bài 1
a. = -10/3
b. = 14/5
c = 1/9
p = 1/9
bài 2.
a. x= 271/75
b. x = 1/3
bài 2
a. x - 10/3 = 7/15 . 3/5
x - 10/3 = 7/25
x = 7/25 + 10/3
x = 271/75
b. 8/23 . 46/24 - x = 1/3
2/3 - x = 1/3
x = 2/3 - 1/3
x = 1/3
\(\frac{15.3^{11}+4.27^4}{9^7}\)
\(=\frac{5.3.3^{11}+4.\left(3^3\right)^4}{\left(3^2\right)^7}\)
\(=\frac{5.3^{12}+4.3^{12}}{3^{14}}\)
\(=\frac{3^{12}.\left(5+4\right)}{3^{14}}\)
\(=\frac{3^{12}.9}{3^{14}}\)
\(=\frac{3^{12}.3^2}{3^{14}}\)
\(=\frac{3^{14}}{3^{14}}\)
\(=1\)
Chúc bạn học tốt !!!
\(A=\frac{15.3^{11}+4.27^4}{9^7}\)
\(\Rightarrow\frac{3.5.3^{11}+4.3^{3.4}}{3^{2.7}}\)
\(\Rightarrow\frac{3^{12}.5+3^{12}.4}{3^{14}}\)
\(\Rightarrow\frac{3^{12}\left(5+4\right)}{3^{14}}\)
\(\Rightarrow\frac{9}{3^2}=\frac{9}{9}=1\)
Vậy ....
a, \(\dfrac{3^8}{3^4}+2^2.2^3\)
= 34 + 25
= 113
b, 3.42 - 2.32
= 3.(42 - 2.3)
= 3.(16 - 6)
= 3.10
= 30
c, \(\dfrac{4^6.3^4.9^5}{6^{12}}\)
= \(\dfrac{\left(2^2\right)^6.3^4.\left(3^2\right)^5}{\left(2.3\right)^{12}}\)
= \(\dfrac{2^{12}.3^4.3^{10}}{2^{12}.3^{12}}\)
= \(\dfrac{3^{14}}{3^{12}}\)
= 32
@Dương Tuyết Mai
a) \(15.3-x=2\left(x-4\right)\)
\(\Leftrightarrow15-x=2x-8\)
\(\Leftrightarrow15+8=2x+x\)
\(\Leftrightarrow23=3x\)
\(\Leftrightarrow x=\dfrac{23}{3}\)
b) \(10-\left|3-x\right|=6.\left(-7\right)\)
\(\Leftrightarrow10-\left|3-x\right|=-42\)
\(\Leftrightarrow\left|3-x\right|=10+42\)
\(\Leftrightarrow\left|3-x\right|=52\)
\(\Leftrightarrow\left[{}\begin{matrix}3-x=52\\3-x=-52\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-49\\x=55\end{matrix}\right.\)
c) \(\left(x-2\right)\left(2y-1\right)=-6\)
\(\Leftrightarrow\left(x-2\right)\left(2y-1\right)=\left(-1\right).6=6.\left(-1\right)=\left(-2\right).3=3.\left(-2\right)=\left(-6\right).1=1.\left(-6\right)=\left(-3\right).2=2.\left(-3\right)\)
Ta có bảng sau:
\(x-2\) | \(-1\) | \(6\) | \(-6\) | \(1\) | \(-2\) | \(3\) | \(-3\) | \(2\) |
\(2y+1\) | \(6\) | \(-1\) | \(1\) | \(-6\) | \(3\) | \(-2\) | \(2\) | \(-3\) |
\(x\) | \(1\) | \(8\) | \(-4\) | \(3\) | \(0\) | \(5\) | \(-1\) | \(4\) |
\(y\) | \(\dfrac{5}{2}\) | \(-1\) | \(0\) | \(\dfrac{-7}{2}\) | \(1\) | \(\dfrac{-3}{2}\) | \(\dfrac{1}{2}\) | \(-2\) |
KL: Vậy...
Tinh luy thua truong roi cu tinh bing thuong
(15.3^7-3^8):(4.9^4)
=(15.2187-6561):(4.6561)
=(32805-6561):26244
=26244:26244
=1
Chúc bn hok tốt
k cho mk nha