\(=11.25-2-\dfrac{5}{7}-5.25\)
=6-2-5/7
=4-5/7=23/7
Đúng 1
Bình luận (3)
Bài 5: Lũy thừa của một số hữu tỉ
Các câu hỏi tương tự
Chứng minh rằng:
a, \(36^{36}-9^{10}⋮45\)
b, \(7^{1000}-3^{1000}⋮10\)
c, \(4^5+2^{11}+8^4⋮7\)
a,frac{-1}{24}-left[frac{1}{4}-left(frac{1}{2}-frac{7}{8}right)right]
b,left[frac{5}{7}-frac{7}{5}right]-left[frac{1}{2}-left(frac{-2}{7}-frac{1}{10}right)right]
c,left(frac{-1}{2}right)-left(frac{-3}{5}right)+left(frac{-1}{9}right)+frac{1}{71}-left(frac{-2}{7}right)+frac{4}{35}-frac{7}{8}
d,left(3-frac{1}{4}+frac{2}{3}right)-left(5-frac{1}{3}-frac{6}{5}right)-left(6-frac{7}{4}+frac{3}{2}right)
e,left(frac{1}{2}-frac{13}{14}right):frac{5}{7}-left(frac{-2}{21}+frac{1}{7}right):frac{5}{7}
g,f...
Đọc tiếp
a,\(\frac{-1}{24}-\left[\frac{1}{4}-\left(\frac{1}{2}-\frac{7}{8}\right)\right]\)
b,\(\left[\frac{5}{7}-\frac{7}{5}\right]-\left[\frac{1}{2}-\left(\frac{-2}{7}-\frac{1}{10}\right)\right]\)
c,\(\left(\frac{-1}{2}\right)-\left(\frac{-3}{5}\right)+\left(\frac{-1}{9}\right)+\frac{1}{71}-\left(\frac{-2}{7}\right)+\frac{4}{35}-\frac{7}{8}\)
d,\(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5-\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
e,\(\left(\frac{1}{2}-\frac{13}{14}\right):\frac{5}{7}-\left(\frac{-2}{21}+\frac{1}{7}\right):\frac{5}{7}\)
g,\(\frac{4}{9}:\left(\frac{-1}{7}\right)+6\frac{5}{9}:\left(\frac{-1}{7}\right)\)
tính
a |-5|.7^4+7^3.25/7^5.125-7^5.50
b (-0,25)^-5.9^4.(-2)^-3 - 2^-2.6^9/2^9.3^6 +6^6.40
B1:Tính
a)(-2/3+3/7):4/5+(-1/3+4/7):4/5
b)5/9:(1/11-5/22)+5/9:(1/15-2/3)
c)4^2.4^3/4^10
d)(0,6)^5/(0,2)^6
e)2^7.9^3/6^5.8^2
g)6^3+3.6^2+3^3/-13
h)(3/7+1/2)^2
i)(3/4-5/6)^2
k)5^4.20^44/25^5.4^5
l)(-10/3)^5.(-6/5)^4
f)(1+2/3-1/4).(4/5-3/4)^2
m)2:(1/2-2/3)^3
n)9.9.(-1/3)^3+1/3
y)(4.2^5):(2^3.1/16)
Rút gọn
a) \(\dfrac{2^{15}.9^4}{6^6.8^3}\)
b) \(\dfrac{45^{15}.5^{15}}{75^{15}}\)
c) \(\dfrac{8^{10}+4^{10}}{8^4+4^{11}}\)
d) \(\left(x^2\right)^5:\left(x^5\right)^2\)
các bn tl giùm mik câu này nhé (cám ơn trc )
a, x/2008 - 1/10 -1/15 - 1/21 -...- 1/120 = 5/8
b, 7/x + 4/5.9 + 4/9.13 +...+ 4/41.45 = 29/45
C= 1/3.5 + 1/5.7 +...+ 1/2.(x+1).(2x+3) = 15/95
đề bài là tìm x thỏa mãn
bn nào tl đc mik tick liền
Bài 1:Tính giá trị biểu thức
_{1,}3^2.dfrac{1}{243}.81^2.dfrac{1}{3^3}
_{2,}(4.2^5):left(2^3.dfrac{1}{16}right)
_{3,}left(2^{-1}+3^{-1}right)+left(2^{-1}.2^0right):2^3
_{4,}left(-dfrac{1}{3}right)^{-1}-left(-dfrac{6}{7}right)^0+left(dfrac{1}{2}right)^2:2
_{5,}[(0,1)^2]^0+[(dfrac{1}{7})^{-1}]^2.dfrac{1}{49}.left[left(2^2right)^3:2^5right]
Bài 2:Rút gọn biểu thức
a,dfrac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}
b,dfrac{3^6.45^4-15^{13}.5^{-9}}{27^4.25^3+45^6}
c,left(dfrac{2}{5}right)^7.5^7+left(...
Đọc tiếp
Bài 1:Tính giá trị biểu thức
\(_{1,}\)\(3^2.\dfrac{1}{243}.81^2.\dfrac{1}{3^3}\)
\(_{2,}\)(\(4.2^5\)):\(\left(2^3.\dfrac{1}{16}\right)\)
\(_{3,}\)\(\left(2^{-1}+3^{-1}\right)+\left(2^{-1}.2^0\right):2^3\)
\(_{4,}\)\(\left(-\dfrac{1}{3}\right)^{-1}-\left(-\dfrac{6}{7}\right)^0+\left(\dfrac{1}{2}\right)^2:2\)
\(_{5,}\)[(0,1)\(^2\)]\(^0\)+[(\(\dfrac{1}{7}\))\(^{-1}\)]\(^2\).\(\dfrac{1}{49}.\left[\left(2^2\right)^3:2^5\right]\)
Bài 2:Rút gọn biểu thức
a,\(\dfrac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}\)
b,\(\dfrac{3^6.45^4-15^{13}.5^{-9}}{27^4.25^3+45^6}\)
c,\(\left(\dfrac{2}{5}\right)^7.5^7+\left(\dfrac{9}{4}\right)^3:\left(\dfrac{3}{16}\right)^3\)
\(\overline{2^7.5^2+512}\)
d,\(\left(\dfrac{2}{3}\right)^3.\left(-\dfrac{3}{4}\right)^2.\left(-1\right)^5\)
\(\overline{\left(\dfrac{2}{5}\right)^2}.\left(-\dfrac{5}{12}\right)^3\)
tính
1, 125^5:25^7
2, 27^8:9^9
3,36^5:6^8
4, 49^6:7^10
5, 7^20:49^9
6, 1/2^10:1/8^3
7, (-1/2)^21:1/4^10
8,1/16^5:(-1/2)^18
9,1/5^30:1/25^14
10, 1/125^6:1/25^14
chứng minh rằng
a) \(8^7-2^{18}\) chia hết cho 14
b) \(5^5-5^4+5^3\) chia hết cho 7
c) \(7^6+7^5-7^4\) chia hết cho 11
bn nào bt lm lm giúp mk vs mai mk nộp r
-3/5+2/7: (4/5-x) =1/3