Thực hiện phép tính: 9.(-3)
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1) 5 + (-4) = 1
2) (-8) + 2 = -6
3) 8 + (-2) = 6
4) 11 + (-3) = 8
5) (-11) + 2 = -9
6) (-7) + 3 = -4
7) (-5) + 5 = 0
8) 11 + (-12) = -1
9) (-18) + 20 = 2
10) (15) + (-12) = 3
11) (-17) + 17 = 0
12) 16 + (-2) = 14
13) (30) + (-14) = 16
14) (-19) + 20 = 1
15) (-18) + 15 = -3
16) (10) + (-6) = 4
17) (-28) + 14 = -14
18) 15 + (-30) = -15
19) (15) + (-4) = 11
20) (-21) + 11 = -10
21) 8 + (-22) = -14
22) (-15) + 4 = -11
23) (-3) + 2 = -1
24) 17 + (-14) = 3
25) 17 + (-14) = 3
\(\dfrac{3}{x-3}-\dfrac{6x}{x^2-9}=\dfrac{3\left(x+3\right)}{\left(x-3\right)\left(x+3\right)}-\dfrac{6x}{\left(x-3\right)\left(x+3\right)}=\dfrac{3x+9}{\left(x-3\right)\left(x+3\right)}-\dfrac{6x}{\left(x-3\right)\left(x+3\right)}=\dfrac{3x+9-6x}{\left(x-3\right)\left(x+3\right)}=\dfrac{-3x+9}{\left(x-3\right)\left(x+3\right)}=\dfrac{-3\left(x-3\right)}{\left(x-3\right)\left(x+3\right)}=\dfrac{-3}{x+3}\)
=(1-1/4)(1-1/9)*...*(1-1/100^2)
=1/2*2/3*...*99/100*3/2*4/3*...*101/100
=1/100*101/2
=101/200
\(\left\{240-\left[76-\left(9-3\right)^2\right]\right\}:50\)
\(=\left[240-\left(76-6^2\right)\right]:50\)
\(=\left[240-\left(76-36\right)\right]:50\)
\(=\left(240-40\right):50\)
\(=200:50\)
\(=4\)
_______________
\(\dfrac{4^6\cdot3^4\cdot9^5}{6^{12}}\)
\(=\dfrac{2^{12}\cdot3^4\cdot3^{10}}{6^{12}}\)
\(=\dfrac{2^{12}\cdot3^{14}}{2^{12}\cdot3^{12}}\)
\(=\dfrac{1\cdot3^2}{1\cdot1}\)
\(=3^2\)
\(=9\)
\(\dfrac{x+3}{x}-\dfrac{x}{x-3}+\dfrac{9}{x^2-3x}=\dfrac{x^2-9-x^2+9}{x\left(x-3\right)}=\dfrac{0}{x\left(x-3\right)}=0\)
9. (–3) = – (|9| . |–3|) = –(9.3) = –27.