1.I find ____ a useful sport for my health
a.swim b.swimming c.swimmer d.swam
2.when my father retired,he took_____ golf as a hobby to stay health
a.on b.at c.up d.in
3.Sometimes a rainbow_____after the rain.
a.appear b.appears c.not appear d.doesn't appears
4.Lan has the same hobby____Nga
a.as b.for ...
Đọc tiếp
1.I find ____ a useful sport for my health
a.swim b.swimming c.swimmer d.swam
2.when my father retired,he took_____ golf as a hobby to stay health
a.on b.at c.up d.in
3.Sometimes a rainbow_____after the rain.
a.appear b.appears c.not appear d.doesn't appears
4.Lan has the same hobby____Nga
a.as b.for c.of d.on
5.My father's hobby is ____stamps
a.collect b.collecting c.collector d.collection
6.I think collecting old bowls is a very____hobby
a.bore b.bored c.boring boreness
7.My uncle often gives me presents _____special occasions
a.in b.on c.of d.for
8.Do you háve a____hobby?
a.difficulty b.difficulties c.difficult d.differ
9.These gifts are made____eggshells
a.to b.for c.of d.at
\(a.5\cdot3^x=5\cdot3^4\\ =>3^x=\dfrac{5\cdot3^4}{5}=3^4\\ =>x=4\\ b.7\cdot4^x=7\cdot4^3\\ =>4^x=\dfrac{7\cdot4^3}{7}=4^3\\ =>x=3\\ c.\dfrac{3}{5}\cdot4^x=7\cdot4^3\\ =>4^x=\dfrac{7\cdot4^3}{\dfrac{3}{5}}=\dfrac{35}{3}\cdot4^3\\ =>\dfrac{4^x}{4^3}=\dfrac{35}{3}\\ =>4^{x-3}=\dfrac{35}{3}\\ =>x-3=log_4\dfrac{35}{3}\\ =>x=log_4\dfrac{35}{3}+3\\ d.\dfrac{3}{2}\cdot5^x=\dfrac{3}{2}\cdot5^{12}\\ =>5^x=\dfrac{5^{12}\cdot\dfrac{3}{2}}{\dfrac{3}{2}}=5^{12}\\ =>x=12\)
e: \(9\cdot5^x=6\cdot5^6+3\cdot5^6\)
=>\(9\cdot5^x=9\cdot5^6\)
=>\(5^x=5^6\)
=>x=6
f: \(5\cdot3^x=7\cdot3^5-2\cdot3^5\)
=>\(5\cdot3^x=5\cdot3^5\)
=>\(3^x=3^5\)
=>x=5
g: \(5\cdot3^{x+6}=2\cdot3^5+3\cdot3^5\)
=>\(5\cdot3^{x+6}=5\cdot3^5\)
=>\(3^{x+6}=3^5\)
=>x+6=5
=>x=-1