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-3/18-12/9
=-1/6+-4/3
=-1/6+-8/6
=-9/6
=-3/2
-49/115:7/-115
=-49/115x-115/7
=7
a) -3/18 -12/9
= -1/6 - 4/3
= -1/6 - 8/6
= -1-8/6
= -9/6
= -3/2
= -1/1/2
- Bài 1 = 32/13
- Bài 2 ≈ -332.667
- Bài 3 ≈ 0
- Nha bạn,sai thì cho mình xin lỗi
\(\frac{44.2.60}{11.13.15}=\frac{\left(4.11\right).2.\left(4.15\right)}{11.13.15}=\frac{4.11.2.4.15}{11.13.15}=\frac{4.2.4}{13}=\frac{8.4}{13}=\frac{32}{13}\)
\(123.456456 - 456.123123\) \(=\) \(123.1001.456-456.1001.123=0\)
\(\frac{98.7676-9898.76}{2001.2002.2003...2010}=\frac{0}{2001.2002.2003...2010}=0\)
a.\(12^7:6^7=\left(12:6\right)^7=2^7\)
b. \(27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}=3^3\)
c. \(18^3:9^3=\left(18:9\right)^3=2^3\)
d. \(125^3:25^4=\left(25^3\right)^3:25^4=25^9:25^4=25^5\)
12^7:6^7=(12:6)^7=2^7
27^5:81^3=(3^3)^5:(3^4)^3=3^15:3^12=3^3
18^3:9^3=(18:9)^3=2^3
125^3:25^4=(5^3)^3:(5^2)^4=5^9:5^8=5
\(\text{a)}\left(2^{17}+17^2\right)\left(9^{15}-15^9\right)\left(4^2-2^4\right)\)
\(=\left(2^{17}+17^2\right)\left(9^{15}-15^9\right)\left[\left(2^2\right)^2-2^4\right]\)
\(=\left(2^{17}+17^2\right)\left(9^{15}-15^9\right)\left(2^4-2^4\right)\)
\(=\left(2^{17}-17^2\right)\left(9^{15}-15^9\right).0\)
\(=0\)
\(\text{b)}\left(7^{1997}-7^{1995}\right):\left(7^{1994}.7\right)=\frac{7^{1997}-7^{1995}}{7^{1994}.7}=\frac{7^{1995}\left(7^2-1\right)}{7^{1995}}=7^2-1=48\)
a) 65.100 + 80.125 = 16500
b) 200.4 + 10.20 + 732 = 1732