(满分100分,时间45分) 一、判断题(每小题3分,共15分)1.2是数,不是代数式. ( )2.m~3+n~3的意义是 m 与 n 的立方和.( )3.“a 与1(3/4)的积”用代数式表示为1(3/4)a.( )4.今年某品牌的空调售价为 a 千元,比去年的售价下降了20％,则去年的售价为 a(1+20％)千元. ( )5.“x 的(1/3)减去 y 的5倍的差”用代数式表示为(1/3)x-5y. ( ) (out of 100 points, time is 45 minutes) First, determine the question (3 points for each question, a total of 15 points) 1.2 is a number, not an algebraic expression. () 2.m~3+n~3 is the meaning of m and n cube And .( )3. “The product of a and 1(3/4)” is expressed in algebraic terms as 1(3/4)a.( ) 4. This year’s air conditioner for a certain brand is priced at a thousand dollars, compared to last year’s sale. The price dropped by 20%. Last year’s selling price was a(1+20%) thousand yuan. () 5. “The difference of (1/3) of x minus 5 times of y” is expressed in algebraic expression as (1/ 3) x-5y. ()