help giúp em
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
1. My father is clever enough to repair his car
2. He wasn't hard-working enough to get good grades
3. The man is not rich enough to buy this bike
4. That house is not big enough for they to live in
5. The weather was bad enough for the singer sing
6. He is weak enought to lift all those suitcases
7. We are going to visit their grandmother next Sunday
4:
a: Xét ΔABC vuông tại A và ΔHBA vuông tại H có
góc B chung
=>ΔABC đồng dạng với ΔHBA
b: AH=căn 9*16=12cm
AC=căn 12^2+16^2=20cm
HK=16*12/20=192/20=9,6cm
5:
a: Xét ΔMNP vuông tại N và ΔMHN vuông tại H có
góc M chung
=>ΔMNP đồng dạng với ΔMHN
b: NH=căn 16*9=12cm
NP=căn 16^2+12^2=20cm
HK=16*12/20=192/20=9,6cm
\(\left\{{}\begin{matrix}2\left(x+y\right)+\sqrt{x+1}=4\\\left(x+y\right)-3\sqrt{x+1}=-5\end{matrix}\right.\left(x\ge-1\right)\)
Đặt \(\left\{{}\begin{matrix}a=x+y\\b=\sqrt{x+1}\end{matrix}\right.\left(b\ge0\right)\)
\(\Rightarrow\left\{{}\begin{matrix}2a+b=4\\a-3b=-5\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}2a+b=4\left(1\right)\\2a-6b=-10\left(2\right)\end{matrix}\right.\)
Lấy \(\left(1\right)-\left(2\right)\Rightarrow7b=14\Rightarrow b=2\Rightarrow2a=4-2=2\Rightarrow a=1\)
\(\Rightarrow\left\{{}\begin{matrix}x+y=1\\\sqrt{x+1}=2\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}y=-2\\x=3\end{matrix}\right.\)
\(ƯCLN\left(3468,1620,2400\right)\)
Ta có: \(3468=2^2.3.17^2\)
\(1620=2^2.3^4.5\)
\(2400=2^5.3.5^2\)
\(\RightarrowƯCLN\left(3468,1620,2400\right)=2^2.3.5.17^2=17340\)
Chúc bạn học tốt!
\(3468=2^2.3.17^2\)
\(1620=2^2.3^4.5\)
\(2400=2^5.3.5^2\)
=> ƯCLN(3468,1620,2400) = \(2^2.3=12\)
If he didn't have to study for his exam, he could go out