Are two-part words like binoculars plural or singular?

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• 1. BD is the angular bisector of △ ABC, de ⊥ BC and E. if s △ ABC = 60cm to the second power; ab = 12cm, BC = 18cm, then s △ DBC = - CM & # 178;, de = - cm
• 2. Plant the seeds in the soil
• 3. There is a round flower bed in the park, with a circumference of 50.24 meters. There is a 1 meter wide path around it. How many square meters is the area of the path?
• 4. Fill in the blanks with the verb be. This pair of shoes -- for Nick Then the shoes - whirt
• 5. N is a natural number (n is not equal to 0). What are the two adjacent natural numbers?
• 6. If a is a natural number that is not zero, what is 8 / 1 △ a 1 / 8 △ a = how much? 1 / a △ 8 = how much?
• 7. For any natural number n, the ratio of the sum of the first n terms to the sum of the first 2n terms is a fixed value, then the general term of an
• 8. 3*（1+2+3+4+.n）-n =3*（1+n）*n/2-n =(3n^2+n)/2 How to simplify to the last step
• 9. If the general term formula of sequence {an} is a quadratic function of N and A1 = 2, A2 = 6, A3 = 12, find the general term formula of {an} N is under a
• 10. Let {an} be an arbitrary equal ratio sequence, the sum of the first n terms, the sum of the first 2n terms and the sum of the first 3N terms be x, y and Z respectively, then () A. x+z=2yB. y（y-x）=z（z-x）C. y2=xzD. y（y-x）=x（z-x）
• 11. As shown in the figure, △ abczh, ad: DB = 1:2, de parallel to BC, if s △ ABC = 9, what is the area of quadrilateral dbec
• 12. English translation Hands on brow bones - shame Tight lips - embarrassment Scratching your head - at a loss Repeated rubbing of hands - anxiety Playing with ties or accessories - restless Unfocused, left and right - scared Arms in arms - self protection, uneasiness Hands in belt and shoulders up - tense
• 13. ﹙x＋y﹚／2＋﹙x－y﹚3=6 2﹙x＋y﹚－3x＋3y=24
• 14. Is bamboo an uncountable noun?
• 15. There is a fraction, the denominator plus 1 equals 1 / 2, the denominator minus 1 equals 3 / 5?
• 16. Two pairs of knives and forks
• 17. LD, BBC, PRC, MTV, UN, a.m, p.m
• 18. English, nouns, verbs, adjectives, adverbs, numerals, pronouns, prepositions, conjunctions, articles, exclamations, how to transform into other forms! English, adjectives, adverbs, numerals, pronouns, prepositions, conjunctions, articles, exclamations, how to transform into other forms! (change all forms!
• 19. In △ ABC, ∠ BAC = 90 °, ab = 3, AC = 4, ad bisects ∠ BAC and intersects BC with D, then the length of BD is () A. 157B. 125C. 207D. 215
• 20. English translation My mother will buy me a bike soon. Tom is going to have a party tomorrow. I'm going to visit the Great Wall tomorrow morning. 4 I'm leaving for Beijing on Friday. 5 my friends are coming tonight