How many meters is 18 square meters equal to multiplied by how many meters

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• 1. How many square meters is 2.5 meters multiplied by 3.5 meters?
• 2. How much is 13:10-10:30
• 3. How much is the square of 6 plus the square of 7 plus the square of 8 plus the square of 9, the square of 10 plus the square of 11 plus the square of 12 plus the square of 13 plus the square of 14 plus the square of 15?
• 4. What is 1 + 1 + 1 + 1 + 10 + 12 + 13 + 17
• 5. How many centimeters is four fifths of a meter?
• 6. How many meters is ten li
• 7. (1) How many centimeters is a kilometer? 2. What are the length units? 3. What kind of units does a kilometer belong to (1) How many centimeters is a kilometer (2) What are the length units? "Don't write arithmetic" (3) What kind of unit does the kilometer belong to? In order from large to small, which unit is the kilometer? "Don't write arithmetic" (4) How many millimeters is a kilometer
• 8. How many meters per second is 1 km / h
• 9. How many kilograms is one ton equal to? How many kilograms is one kilogram? How many kilometers is one kilometer? How many centimeters is one meter?
• 10. 250 meters ten meters is one kilometer
• 11. How many meters multiplied by two square meters?
• 12. The difference between element symbol and chemical formula It's not clear. Be specific
• 13. A. B2 -, C + particles all have ten extra nuclear electrons. The element symbol of a is () and the chemical formula of C2B is () of the compound composed of B and hydrogen The chemical formula is () to explain
• 14. Element symbols and chemical formulas In the later chemical formula, like H20, it has four meanings (macro and micro angles), but some element symbols also have four meanings, and some do not. How can we distinguish them
• 15. Writing order of element symbols in chemical formula Example: si60c60
• 16. If the chemical formula of C is A2B5, the chemical equation of the reaction is () A. 2AB2+B2═2CB. 3AB2+B2═2CC. 4AB2+B2═2CD. AB2+4B2═2C
• 17. The chemical formula of compound x is a2b3. The mass ratio of a to B is 7:12. In compound y, the mass ratio of a to B is 7:20,
• 18. All forms of valence AB, AB2, AB3, a2b3, A2B, a3b, a3b2, e.g. A2B water A2B; water H2O AB2; CO2 the more CO2 the better
• 19. According to the chemical equation: 3AB + c2b3 = 2C + 3x, the chemical formula of X is determined as () A. AB2B. A3B2C. A2B3D. AB3
• 20. According to the chemical equation: 3AB + c2b3 = 2C + 3x, the chemical formula of X is determined as () A. AB2B. A3B2C. A2B3D. AB3