(125:25)3
mọi người giúp em với ạ
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TYPE 1
if i have time,i will watch a movie
if we don't hurry up,we will miss our flight
TYPE 2
if i spoke English,i would work in America
if i had a lot of money,i could travel everywhere
if i were you,i wouldn't do that
TYPE 3
If I had studied harder, I would have passed the exam
If it hadn't rained, she would have gone to the beach
She would have been there on time if her car hadn't broken down
If he hadn’t got a job in London ,he would have married Jennie.
\(a.\dfrac{12}{3}=\dfrac{20}{5}=4\\ b.\dfrac{9}{-3}=\dfrac{-15}{5}=-3\)
a, Xét \(\dfrac{x}{3}=4\Rightarrow x=12;\dfrac{20}{y}=4\Rightarrow y=\dfrac{20}{4}=5\)
b, \(\dfrac{9}{-x}=-3\Rightarrow-x=-3\Leftrightarrow x=3\)
\(\dfrac{y}{5}=-3\Rightarrow y=-15\)
a)
17-229+17-25+229
=34-25+0
=9
b)
125-679+145-125+679
= 0 + 145 + 0
=145
a)17-229+17-25+229 b)125-679+145-125-629
=(17-17)+(229-229)+25 =(125-125)+(679-679)+145
=0+0+25 = 0+0+145
25 =145
a:ta có: \(2x^2\ge0\)
\(\Leftrightarrow2x^2+1>0\forall x\)
vậy: H(x) vô nghiệm
x-3/-9 = -4/x-3
(x-3)^2=-9.-4=36
=>TH1 x-3= 6
TH2 x-3 = -6
=> TH1: X= 9
TH2: X=-3
x,y∈Z⇒x+1,xy-1∈Z và x+1,xy-1 thuộc Ư(3)
Ta có bảng:
x+1 | 1 | 3 | -1 | -3 |
xy-1 | 3 | 1 | -3 | -1 |
x | 0 | 2 | -2 | -4 |
y | loại | 1 | 1 | 0 |
Vậy \(\left(x,y\right)\in\left\{\left(2;1\right)\left(-2;1\right);\left(-4;0\right)\right\}\)
Vì x,y là chữ số nên \(x,y\in\left\{0;1;2;3;4;5;6;7;8;9\right\}\)
Ta có \(\left(x+1\right)\left(xy-1\right)=3=3.1=1.3\)
Với \(\left\{{}\begin{matrix}x+1=3\\xy-1=1\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=2\\y=1\end{matrix}\right.\)
Với \(\left\{{}\begin{matrix}x+1=1\\xy-1=3\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0\\-1=3\end{matrix}\right.\left(loại\right)\)
Vậy \(\left(x;y\right)=\left(2;1\right)\)
(125:25)3
= 53 ( 5.5.5)
= 125
\(\left(125:25\right)^3\)
\(=5^3\)
\(=125\)