Tính giá trị biểu thức (-6).9 -(-9).8
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4/9 x 3/8 + 5/8 = 1/6 + 5/8 = 19/24
1/3 : 1/6 - 5/11 = 2 - 5/11 = 17/11
1/6 : 1/4 x 9/8 = 2/3 x 9/8 = 3/4
5/6 + 9/12 : 18/5 = 5/6 + 3/4 : 18/5
= 5/6 + 3/4 x 5/18
= 5/6 + 15/72
= 5/6 + 5/24
= 20/24 + 5/24
= 25/24
5/7 + 9/8 - 15/28 = 40/56 + 63/56 - 30/56
= 103/56 - 30/56
= 73/56
\(\dfrac{5}{6}+\dfrac{9}{12}:\dfrac{18}{5}\)
\(=\dfrac{5}{6}+\dfrac{5}{24}\)
\(=\dfrac{25}{24}\)
\(---\)
\(\dfrac{5}{7}+\dfrac{9}{8}-\dfrac{15}{28}\)
\(=\dfrac{103}{56}-\dfrac{15}{28}\)
\(=\dfrac{73}{56}\)
\(A=\left(4^5\times9^4+2\times6^9\right)\div\left(2^{10}\times3^8-6^8\times2\right)\)
\(\Leftrightarrow A=\frac{4^5\times9^4+2\times6^9}{2^{10}\times3^8-6^8\times2}\)
\(\Leftrightarrow A=\frac{\left(2^2\right)^5\times\left(3^2\right)^4+2\times\left(3\times2\right)^9}{2^{10}\times3^8-\left(3\times2\right)^8\times2}\)
\(\Leftrightarrow A=\frac{2^{10}\times3^8+2\times3^9\times2^9}{2^{10}\times3^8-3^8\times2^8\times2}\)
\(\Leftrightarrow A=\frac{2^{10}\times3^8+2^{10}\times3^8\times3}{2^{10}\times3^8-3^8\times2^9}\)
\(\Leftrightarrow A=\frac{3^8\left(2^{10}+2^{10}\times3\right)}{3^8\left(2^{10}-2^9\right)}\)
\(\Leftrightarrow A=\frac{2^{10}+2^{10}\times3}{2^{10}-2^9}\)
\(\Leftrightarrow A=\frac{2^{10}\left(1+3\right)}{2^9\left(2-1\right)}\)
\(\Leftrightarrow A=\frac{2\left(1+3\right)}{2-1}\)
\(\Leftrightarrow A=\frac{2\times4}{1}\)
\(\Leftrightarrow A=8\)
( − 6 ) . 9 − ( − 9 ) . 8 = ( − 54 ) − ( − 72 ) = ( − 54 ) + 72 = 18.