làm nhanh giúp mình với mình con 1h30p nữa thôi cảm ơn
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202,1 : 0,125 + 202,1 : 0,2 - 202,1 : 1/3
= 202,1 x 8 + 202,1 x 5 - 202,1 x 3
= 202,1 x (8 + 5 - 3)
= 202,1 x 10
= 2021
Chắc vậy đó bạn!
202,1 : 0,125 + 202,1 : 2 - 202,1 : 1/3
= 202,1 x 8 + 202,1 x 5 - 202,1 x 3
= 202,1 x ( 8 + 5 - 3 )
= 202,1 x 10
= 2021
~ Hok T ~
1,2 + 2,3 + 3,4 - 4,5 + 5,6 - 6,7 + 7,8 - 8,9 + 9,1 = 9,3
1) Vì x=25 thỏa mãn ĐKXĐ nên Thay x=25 vào biểu thức \(A=\dfrac{\sqrt{x}-2}{x+1}\), ta được:
\(A=\dfrac{\sqrt{25}-2}{25+1}=\dfrac{5-2}{25+1}=\dfrac{3}{26}\)
Vậy: Khi x=25 thì \(A=\dfrac{3}{26}\)
2) Ta có: \(B=\dfrac{\sqrt{x}-3}{\sqrt{x}+1}+\dfrac{2x+8\sqrt{x}-6}{x-\sqrt{x}-2}\)
\(=\dfrac{\left(\sqrt{x}-3\right)\left(\sqrt{x}-2\right)}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}+\dfrac{2x+8\sqrt{x}-6}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{x-5\sqrt{x}+6+2x+8\sqrt{x}-6}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{3x+3\sqrt{x}}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{3\sqrt{x}\left(\sqrt{x}+1\right)}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{3\sqrt{x}}{\sqrt{x}-2}\)
1.started smoking cigarettes a month ago
2. to walk at twenty minutes to school every morning
3.I haven't seen my uncle for two years
4.going to the movies tonight?
5.so stayed at home from school yesterday
6.me three hours to make...
7.gardening at the weekend
8.để nguyên vế sau
10.watching...
11.Minh ....
12.seen her since 2001
1. The last time he smoked was a month ago
2. it takes me twenty minutes to walk to school every morning.
3. I haven't seen my uncle for two years
4. Let's go to the movies tonight.
5. July had a high fever, so she stayed home from school yesterday.
6. I spent three hours making this pottery jug
7. My father enjoys gardening at the weekend
8. What about going swimming this afternoon?
9. My father is interested in playing board games.
10. He enjoys watching football very much.
11. Because Minh was sick, she could not go to school.
12. We haven't seen her since 2001
a: \(\widehat{B}+\widehat{C}=90^0\)
c: Góc kề bù với C bằng tổng của góc A cộng góc B