Ngắt chiếc lá từ cây trồng ngoài nắng , hãy tiến hành thí nghiệm xác định chất mà lá chế tạo được khi có ánh sáng (Em đang học chuyên gặp câu này bí quá mọi người có thể giúp em được không ạ , Biết là lá chế tạo đc khi có ánh sáng là tinh bột , nhưng em không biết làm thí nghiệm để chứng minh ) em cảm ơn !

1, tính nhanh a,25 . 5 . 4 . 27 . 2 b,135 + 360 +65 + 22 c, 20 + 21 + 22 + ...... + 29 + 30 2, tìm x a, (x - 34 ) . 15 = 0 b, 18 . ( x - 16 ) = 18

Giải các phương trình sau a) căn(2x+1)- căn(x+3)+ căn(2x-1)- căn(x-1)=0 b) x- căn(2x-1)+ (x-1)^2=0 Mong các bn giúp đỡ, mình cần gấp

mọi người giải giúp mình với, mình đang cần gấp lắm ạ, mọi người thấy thì giải dùm mình với. Cuwusuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu! mình đang cần câu 3 nhất ạ : cho a, b, c > 0, CMR: a^2(b+c-a) + b^2(a+c-b) + c^2(a+b-c) <= 3abc

𝗘𝘅𝗲𝗿𝗰𝗶𝘀𝗲 1. 𝗙𝗶𝗻𝗱 𝗼𝘂𝘁 𝘁𝗵𝗲 𝘀𝗲𝗻𝘁𝗲𝗻𝗰𝗲 𝘁𝗵𝗮𝘁 𝗵𝗮𝘀 𝘁𝗵𝗲 𝘀𝗮𝗺𝗲 𝗺𝗲𝗮𝗻𝗶𝗻𝗴 𝗮𝘀 𝘁𝗵𝗲 𝗼𝗿𝗶𝗴𝗶𝗻𝗮𝗹 𝗼𝗻𝗲 1. Ron enjoys horseback riding. Bob enjoys horseback riding, too A. Both Ron and Bob enjoys horseback riding. B. Both Ron and Bob enjoy horseback riding. C. Neither Ron or Bob enjoys horseback riding. D. Either Ron or Bob enjoys horseback riding. 2. Arthur is absent. Ricardo is absent, too. A. Arthur is absent but Ricardo is not. B. Both Ricardo and Arthur is absent. C. Both Ricardo and Arthur are present. D. Both Ricardo and Arthur are absent. 3. Coal is an irreplaceable natural resource. Oil is also an irreplaceable natural resource. A. Neither coal or oil is an irreplace natural resource. B. Either coal or oil is an irreplace natural resource. C. Both coal and oil are irreplaceable natural resources. D. Both coal and oil is irreplaceable natural resources. 4. She is both beautiful and intelligent. A. She is not only beautiful bout also intelligent. B. She is either intelligent or beautiful. C. She is neither intelligent or beautiful. D. She is beautiful but she is not intelligent. 5. She is bith a teacher and a good wife. A. She is not a good wife and a teacher. B. She is a teacher although she is a good wife. C. In spite of being a goood wife, she is not a teacher. D. She is not only a teacher but also a good wife. 6. Jane hasn't written me a letter for 2 weeks. Tom hasn't written me for 2 weeks. A. Jane hasn't written me a letter for 2 weeks, so has Tom. B. Jane hasn't written me a letter for 2 weeks, neither has Tom. C. Jane hasn't written me a letter for 2 weeks, Tom has, too. D. Jane hasn't written me a letter for 2 weeks, Tom also has. 7. His gramma was surprised at his school report. His dad's feeling was the same. A. His gramma was surprised at his school report, his dad, either. B. His gramma was surprised at his school report, so was his dad's feeling. C. His gramma was surprised at his school report, neither his dad's feeling. D. His gramma was surprised at his school report, his dad did, too. 8. I haven't ever tastes caviar, my classmate Lam has, either. A. I haven't ever tastes caviar, neither my classmate Lam has. B. I haven't ever tastes caviar, neither has my classmate Lam. C. I haven't ever tastes caviar, also my classmate Lam has. D. Both I and Lam haven't tasted caviar.

X mũ 2 cộng x cộng y mũ 2 trừ y trừ 2xy

Vẽ cho ny anime girl nha mn Mụn rồi nên ny đi ngủ ây mai vote sau, chúc các pác ngủ ngon nhoa ><

Tìm điều kiện xác định của biểu thức sau √-5/x^2+6 ( căn của cả phân số )

giải pt : $\sqrt[2]{4-\sqrt[2]{4+x}}$ =x

Tìm điều kiện xác định của biểu thức sau √4/x+3