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整式的加减是初中代数的基础知识,在中考中经常被考查,我们一定要学好它.考点1:用字母表示数例1(1)“a的2倍与1的和”用代数式表示是.(2)孔明同学买铅笔m支,每支0.4元,买练习本n本,每本2元.那么他买铅笔和练习本一共花了____元.(3)一筐苹果总的质量为x千克,筐本身的质量为2千克,若将苹果平均分成5份,则每份的质量为____千克.解析:本题考查用字母表示数,难度不
The addition and subtraction of the whole formula is the basic knowledge of junior high school algebra, and it is often examined in the middle of the exam. We must learn it well. Test point 1: Use letters to represent the number of cases 1(1)“a 2 times and 1’s sum” using algebraic expressions Said that it was. (2)Mr. Kong Ming bought m pencils, each costing 0.4 yuan, and buying an exercise book for 2 yuan per book. Then he spent a total of ____yuan for buying pencils and exercise books. (3) A basket of apples The total mass is x kilograms, and the mass of the basket itself is 2 kilograms. If the average apple is divided into 5 parts, the quality of each part is ____ kilograms. Analytical: This question test uses letters to indicate the number, the difficulty is not