4/5-3/4.4/5.3/4
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{4}{5}-\dfrac{3}{4}.\dfrac{4}{5}.\dfrac{3}{4}\)
\(=\dfrac{4}{5}-\dfrac{9}{20}\)
\(=\dfrac{16}{20}-\dfrac{9}{20}\)
\(=\dfrac{7}{20}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
tính bằng cách thuận tiện nhất
a x 3,7 + a x 5,3 + a = 45
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1.\dfrac{27^4.4^3}{9^5.8^2}=\dfrac{3^{12}.2^6}{3^{10}.2^6}=3^2=9\)
\(2.\dfrac{8^5.3^{15}}{2^{14}.81^4}=\dfrac{2^{15}.3^{15}}{2^{14}.3^{16}}=\dfrac{2}{3}\)
Ý 1:
\(\dfrac{27^4.4^3}{9^5.8^2}=\dfrac{\left(3^3\right)^4.\left(2^2\right)^3}{\left(3^2\right)^5.\left(2^3\right)^2}=\dfrac{3^{12}.2^6}{3^{10}.2^6}=3^2=9\)
Ý 2:
\(\dfrac{8^5.3^{15}}{2^{14}.81^4}=\dfrac{\left(2^3\right)^5.3^{15}}{2^{14}.\left(3^4\right)^4}=\dfrac{2^{15}.3^{15}}{2^{14}.3^{16}}=\dfrac{2^{14}.2.3^{15}}{2^{14}.3^{15}.3}=\dfrac{2}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3^0.3^5.3^7=3^{12}\)
\(16^3:4^2=4^6:4^2=4^4\)
\(2^4.4^3=2^4.2^6=2^{10}\)
\(2^4.5^4\left(2.5\right)^4=10^4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{3^4.2^3-3^4.4}{3^5.3^2-3^5.5}=\frac{3^4.\left(2^3-4\right)}{3^5.\left(3^2-5\right)}=\frac{8-4}{3.\left(9-5\right)}=\frac{4}{3.4}=\frac{1}{3}\)
\(\frac{3^4\cdot2^3-3^4\cdot4}{3^5.3^2-3^5\cdot5}=\frac{3^4\left(8-4\right)}{3^5\left(9-5\right)}=\frac{4}{3\cdot4}=\frac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm:
\(A=\frac{3^4.2^3-3^4.4}{3^5.3^2-3^5.5}\)
\(A=\frac{2^2.3^4\left(2-1\right)}{3^5\left(3^2-5\right)}\)
\(A=\frac{4.1}{3.4}=\frac{1}{3}\)
= 4/5 - 9/16.4/5
= 4,5.(1-9/16)
= 4,5. 7/16
= 7/20