a) 123 / ( 3-4,64 )
= 1 728 / ~ 0,0 061
= ~ 283 278, 6 885
b) \(\left(\frac{3}{7}\right)^5\cdot\left(\frac{7}{3}\right)^{-1}\cdot\left(\frac{5}{3}\right)^6:\left(\frac{343}{625}\right)^{-2}\)
= ~ 0,0 145 . ~ 0,4 286 . ~ 21,4 335 / ~ 3,3 203
= ~ 0,0 062 . ~ 6,4 553
= ~ 0,04
c) 54 . 125 . ( 2,5 )-5 . 0,04
= 625 . 125 . 0,01 024 . 0,04
= 78 125 . 0,0 004 096
= 32
a) 54 x125 x (2,5)-5 x 0,04
b) (3/7)5 x (7/3)-1 x (5/3)6 : (343/625)-2
(3/7)5.(7/3)-1.(5/3)6:(343/625)-2= ?
Viết các biểu thứ dưới dạng lũy thừa của một số nguyên:
a)\(12^3.\left(3^{-4}.64\right)\).
b)\(\left(\frac{3}{7}\right)^5.\left(\frac{7}{3}\right)^{-1}.\left(\frac{5}{3}\right)^6:\left(\frac{343}{625}\right)^2\)
viết biểu thức sau dưới dạng a^n
(3/7)^5 x (7/3)^7 x (5/3)^6 : (343/625)
\(\left(\frac{3}{7}\right)^5.\left(\frac{7}{3}\right)^{-1}.\left(\frac{5}{3}\right)^6:\left(\frac{343}{625}\right)^{-2}\)
Thuc hien phep tinh:
a/\(\frac{\frac{1}{9}-\frac{1}{7}-\frac{1}{11}}{\frac{4}{9}-\frac{4}{7}-\frac{4}{11}}\)+ \(\frac{0,6-\frac{3}{25}-\frac{3}{125}-\frac{3}{625}}{\frac{4}{5}-0,16-\frac{4}{125}-\frac{4}{625}}\)
b/ \(\frac{2^{12}.3^5-4^6.9^2}{\left(2^2.3\right)^6+8^4.3^5}-\frac{5^{10}.7^3-25^5.49^2}{\left(125.7\right)^3+5^9.14^3}\)
Bài 1: a, x + 0,5 = -2/3 b, x - (-2/5) = 5/7 c, 5/4 - 6x = 7 1/2 d, 3 - 2x - (5/4 - 7/5) = 9/20 bài 2: a, x : (-2/3) mũ 3 = -2/3 b, (2/5) mũ 5 nhân x = (2/5) mũ 7 c, 343/125 = (7/5) mũ x d, (-1/3) nhân x = 1/243
tính
2,\(A=\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{-0,625+0,5-\frac{5}{11}-\frac{5}{12}}+\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
3,\(B=\frac{\frac{1}{3}-\frac{1}{7}-\frac{1}{13}}{\frac{2}{3}-\frac{2}{7}-\frac{2}{13}}.\frac{\frac{1}{3}-0,25+0,2}{1\frac{1}{6}-0,875+0,7}+\frac{6}{7}\)
Thực hiện phép tính:
\(A=\dfrac{2^{12}.3^5-4^6.9^2}{\left(2^2.3\right)^6+8^4.3^5}-\dfrac{5^{10}.7^3-25^5.49^2}{\left(125.7\right)^3+5^9.14^3}\)
\(B=\dfrac{1-\dfrac{1}{\sqrt{49}}+\dfrac{1}{49}-\dfrac{1}{\left(7\sqrt{7}\right)^2}}{\dfrac{\sqrt{64}}{2}-\dfrac{4}{7}+\dfrac{2^2}{7^2}-\dfrac{4}{343}}\)
