\(\frac{27\times18+27\times103-120\times27}{15\times33+33\times12}\)
\(\frac{27\cdot18+27\cdot103-120\cdot27}{15\cdot33+33\cdot12}\)
=27.(18+103-120)/33.(15+12)
= 27.1/33.27
=1/33
\(=\frac{27\left(18+103-120\right)}{33\left(15+12\right)}\)
\(=\frac{27\times1}{33\times27}\)
\(=\frac{1}{33}\)
Tính nhanh:
27 . 18 +27 .103 -120 . 27
15 . 33 + 33 . 12
\(\frac{27.18+27.103-120.27}{15.33+33.12}\)
\(=\frac{27\left(18+103-120\right)}{33\left(15+12\right)}\)
\(=\frac{27.1}{33.27}\)
\(=\frac{1}{33}\)
\(\frac{9\times15\times21\times12\times20}{5\times6\times45\times18\times4}=?\)
=\(\frac{3\times3\times3\times5\times3\times7\times2\times6\times4\times5}{5\times2\times3\times5\times3\times3\times3\times6\times4}=7\)
\(\frac{9x15x21x12x20}{5x6x45x18x4}=\frac{3x3x15x3x7x3x4x5x4}{5x6x15x3x3x3x2x4}=\frac{15x7x3x4}{6x2}=\frac{1260}{12}=105\)
Tính tỷ số \(\frac{A}{B}\)
\(A=\frac{4}{9\times31}+\frac{5}{31\times12}+\frac{9}{36\times15}+\frac{13}{15\times58};B=\frac{5}{27\times8}+\frac{7}{8\times39}+\frac{9}{39\times12}+\frac{10}{12\times58}\)
Tính nhanh:
49,35 - 20,18 - 12,17
0,25 x 3,6 x 0,4 : 6
\(\frac{144\times18}{84\times27}\)
49.35 - 20.18 - 12.17
= 29.17 - 12.17
= 17
0.25 x 3.6 x 0.4 : 6
= 0.9 x 0.4 : 6
= 0.36 : 6
= 0.06
\(\frac{144x18}{84x27}\)
= \(\frac{8}{7}\)
=49,35-32.35=17
(0.25x0.4)x(3.6:6)=0.1x0.6=0.06
\(\frac{2x2x2x2x3x3x3x3x3}{2x2x3x7x3x3x3}=\frac{2x2x3}{7}=\frac{12}{7}=15_7\)
Rút gọn phân số:
a)\(\frac{9}{33-6}\)
b)\(\frac{7}{10^2+6\times10^2}\)
c)\(\frac{11\times12+33\times36+55\times60}{22\times24+66\times72+110\times120}\)
d)\(\frac{9^4\times27^5\times3^6\times4^4}{3^8\times81^4\times243\times8^2}\)
e)\(\frac{199919991999}{200020002000}\)
a) \(\frac{9}{33-3}=\frac{1}{3}\)
b) \(\frac{7}{100+6\times100}=\frac{1}{100}\)
c) \(\frac{11\times22+33\times36+55\times60}{22\times24+66\times72+110\times120}=\frac{1}{4}\)
d) \(\frac{9^4\times27^5\times3^6\times4^4}{3^8\times81^4\times243\times8^2}=4\)
e) \(\frac{199919991999}{200020002000}=\frac{1999}{2000}\)
1/Tính
\((3^{47}\times81^{11})\div(27^{20}\times9^{15})\)
\(\frac{9^{24}\times27^{13}}{3^{65}\times81^5}\)
mấy bạn giúp mình với
tặng 3tym cho những người trả lời nhanh nhất
=3^73 x 9^35
b)
tương tự trên , bạn đổi từng số ví dụ như 27^13=9^13 x 3^13 , rồi số dưới giống số trên thì xóa ..v..v..,
p/s: mình bik bạn khó hiểu nhưng mình lười quá , sorry
\(\frac{3}{8\times11}+\frac{4}{11\times15}+\frac{5}{15\times20}+\frac{6}{20\times26}+\frac{7}{26\times33}+\frac{8}{33\times41}+\frac{9}{41\times50}=\frac{2}{5}-2\times x\)
làm ơn giúp em giải bài toán này!!!!!!!!
1 tính :
a)\(\frac{2^{11}\times9^2}{3^5\times16^2}\); b) \(\frac{9^3\times27^2}{6^2\times3^{10}}\); c) \(\frac{27^{15}\times5^3\times8^4}{25^2\times81^{11}\times2^{11}}\)
a) \(\frac{2^{11}.9^2}{3^5.16^2}=\frac{2^{11}.3^4}{3^5.2^8}=\frac{2^3}{3}=\frac{8}{3}\)