\(\frac{9}{6}.\frac{6}{7}+\frac{9}{6}.\frac{4}{5}\)
\(=\frac{9}{6}\left(\frac{6}{7}+\frac{4}{5}\right)\)
\(=\frac{9}{6}\left(\frac{30}{35}+\frac{28}{35}\right)\)
\(=\frac{3}{2}.\frac{58}{35}\)
\(=\frac{174}{70}\)
\(=\frac{87}{35}\)
\(\frac{9}{6}.\frac{6}{7}+\frac{9}{6}.\frac{4}{5}\)
\(=\frac{9}{6}\left(\frac{6}{7}+\frac{4}{5}\right)\)
\(=\frac{9}{6}\left(\frac{30}{35}+\frac{28}{35}\right)\)
\(=\frac{3}{2}.\frac{58}{35}\)
\(=\frac{174}{70}\)
\(=\frac{87}{35}\)
Rút gọn biêu thức
A=3^2.45^4-15^3.9^3/3^3.45^4-5^4.3^10
B=6^30.3^11.7-2^31.5.3^40/2^28.17.3^38-6^27.3^11
C=35.27^8+70.9^11/15.81^6-60.3^20
D=4^6.6^7-9^3.8^6/12^5.2^8+18^3.32^3
Bài 1 Tính hợp lí : a)-4/7-(5/6-4/7)
b) 4/30:(1/6.4/5-1/6.6/5)
rút gọn b=2/5+2/7-2/9-2/11
4/5+4/7-4/9-4/11
Rút gọn biểu thức sau:
C= |15-x| + 2|9-x| - 5| x-9| -7
Rút gọn biểu thức sau 7!×4!/10!×(8!/3!×5!-9!/2!×7!)
Rút gọn
5 * 4^15 * 9^9 - 4 * 3^20 * 8^9 / 5 * 2^9 * 6^19 - 7 * 2^29 * 27^6
* là nhân.
Rút gọn biểu thức 5 mũ 9 * a mũ 7 / ( 5 mũ 8 * a mũ 6 )
Rút gọn \(A=\frac{5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9}{5\cdot2^9\cdot6^{19}-7\cdot2^{29}\cdot3^{18}}\)