giup em gap voi
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x : 4 + x = 3,75
\(x\)x\(\frac{1}{4}\) + \(x=3,75\)
\(x\)x\(\left(\frac{1}{4}+1\right)=\frac{375}{100}\)
\(x\)x\(\frac{5}{4}=\frac{15}{4}\)
\(x=\frac{15}{4}:\frac{5}{4}\)
\(x=\frac{15}{4}\)x\(\frac{4}{5}\)
\(x=3\)
\(\frac{x}{4}+x=3.75\)
\(x\left(\frac{1}{4}+1\right)=\frac{15}{4}\)
\(x\cdot\frac{5}{4}=\frac{15}{4}\)
\(x=\frac{15}{4}:\frac{5}{4}=3\)
a: MNPQ là hình bình hành
=>MQ//NP
=>MQ//IP
Xét tứ giác MIPQ có IP//MQ
nên MIPQ là hình thang
b: ΔMNP vuông cân tại N
=>MN=NP và \(\widehat{MNP}=90^0\)
Hình bình hành MNPQ có \(\widehat{MNP}=90^0\)
nên MNPQ là hình chữ nhật
=>\(\widehat{Q}=\widehat{P}=90^0\)
Xét ΔMNI vuông tại N có \(sinNMI=\dfrac{NI}{MN}=\dfrac{2}{3}\)
nên \(\widehat{NMI}\simeq42^0\)
\(\widehat{NMI}+\widehat{QMI}=\widehat{NMQ}=90^0\)
=>\(\widehat{QMI}+42^0=90^0\)
=>\(\widehat{QMI}=48^0\)
IP//MQ
=>\(\widehat{QMI}+\widehat{MIP}=180^0\)(hai góc trong cùng phía)
=>\(\widehat{MIP}+48^0=180^0\)
=>\(\widehat{MIP}=132^0\)
1. Going in the rain is interesting.
2. Don't forget to learn by heart new words.
3. If he doesn't apologize me, I won't forgive him.
4. My grandmother is the most helpful (person) in my village.
5. What is the price of that hat?
6. Your book is different from my book.
1 Her mother is not as hospitable as her
2 Hung is fond of swimming in the summer
3 Let's travel abroad
4 There are 4 chairs in my room
5 Don't forget to drink more water
6 Minh is the most intelligent student in my class
$Zn + H_2SO_4 \to ZnSO_4 + H_2$
$n_{H_2} = n_{Zn} = \dfrac{19,5}{65} = 0,3(mol)$
$V_{H_2} = 0,3.22,4 = 6,72(lít)$
$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
Theo PTHH :
$n_{Al} = \dfrac{2}{3}n_{H_2} = 0,2(mol)$
$m_{Al} = 0,2.27 = 5,4(gam)$
a, \(x=-\dfrac{3}{5}-\dfrac{1}{2}=\dfrac{-6-5}{10}=-\dfrac{11}{10}\)
b, \(1-\dfrac{16}{5}:x=\dfrac{15}{4}\Leftrightarrow\dfrac{16}{5}:x=-\dfrac{11}{4}\Leftrightarrow x=\dfrac{16}{5}:\left(-\dfrac{11}{4}\right)=-\dfrac{64}{55}\)
c, \(\dfrac{3}{4}-\dfrac{x}{5}=\dfrac{15}{4}\Leftrightarrow\dfrac{x}{5}=\dfrac{12-15}{4}=-\dfrac{3}{4}\Leftrightarrow x=-\dfrac{15}{4}\)