84:2= bao nhiêu vậy ạ
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Tuổi của ông hiện nay:
(84 + 62) : 2 = 73 (tuổi)
Tuổi cháu là:
73 - 62 = 11 (tuổi)
1:
a: BC=8-3=5cm
b: MN=MC+CN=1/2(CA+CB)
=1/2*AB=4cm
2:
a: Có 2 tia là OA và OB
b: AB=OB+OA=11cm
c: AC=BC=11/2=5,5cm
\(P=\left(\dfrac{x\sqrt{x}-1}{x-\sqrt{x}}-\dfrac{x\sqrt{x}+1}{x+\sqrt{x}}\right):\left(\dfrac{2\left(x-2\sqrt{x}+1\right)}{x-1}\right)\left(x>0,x\ne1\right)\)
\(=\left(\dfrac{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}{\sqrt{x}\left(\sqrt{x}-1\right)}-\dfrac{\left(\sqrt{x}+1\right)\left(x-\sqrt{x}+1\right)}{\sqrt{x}\left(\sqrt{x}+1\right)}\right):\left(\dfrac{2\left(\sqrt{x}-1\right)^2}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\right)\)
\(=\left(\dfrac{x+\sqrt{x}+1}{\sqrt{x}}-\dfrac{x-\sqrt{x}+1}{\sqrt{x}}\right):\dfrac{2\left(\sqrt{x}-1\right)}{\sqrt{x}+1}\)
\(=\dfrac{2\sqrt{x}}{\sqrt{x}}:\dfrac{2\left(\sqrt{x}-1\right)}{\sqrt{x}+1}=2.\dfrac{\sqrt{x}+1}{2\left(\sqrt{x}-1\right)}=\dfrac{\sqrt{x}+1}{\sqrt{x}-1}\)
b) \(P=\dfrac{\sqrt{x}+1}{\sqrt{x}-1}=1+\dfrac{2}{\sqrt{x}-1}\)
Để \(P\in Z\Rightarrow2⋮\sqrt{x}-1\Rightarrow\sqrt{x}-1\in\left\{1;2;-1;-2\right\}\)
\(\Rightarrow\sqrt{x}\in\left\{2;3;0\right\}\Rightarrow x\in\left\{4;9;0\right\}\)
\(1,=3ab\left(1-2a+b\right)\\ 2,=\left(x-y\right)\left(x+y\right)-7\left(x+y\right)=\left(x+y\right)\left(x-y-7\right)\\ 3,=\left(a-5\right)\left(5a-2\right)\\ 4,=5x\left(x-3\right)-\left(x-3\right)\left(x+3\right)=\left(x-3\right)\left(4x-3\right)\\ 5,=9a^2-\left(b-2\right)^2=\left(3a-b+2\right)\left(3a+b-2\right)\\ 6,=2x^2-4x+3x-6=\left(x-2\right)\left(2x+3\right)\\ 7,=3x^2\left(2x-5\right)\\ 8,=\left(3x-5\right)\left(3x+5\right)\\ 9,=4x^2\left(x-y\right)-x\left(x-y\right)=x\left(4x-1\right)\left(x-y\right)\)
1 Having slept
2 not being invited
3 Having had
4 having
5 talking
6 succeeded - launching
7 Having travelled
8 Have - considered - trying
9 Having seen - had - to go
10 Being invited
11 Being found
12 having
13 taken - being photographed
14 to fix
15 living
16 Having waited - to deliver - decided to cancel
17 Having photocopied
18 to have happen
19 to give
20 spoiling
42 nha em
42 k cho chị nha