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"Algebraic Formulas" Integral formulas and their addition and subtraction PPT courseware 2
think about it
(1) Xiaohong went to buy a notebook. Each notebook cost 2.5 yuan. She bought m copies. How much did she spend in total on ______ yuan?
(2) Xiao Ming’s 100 m race took t s, so the average speed is ______m/s.
Formulas like n-2, s/5, 0.8a, b/a, 2n+500, abc, 2ab+2ac+2bc, 6a2, etc. are all algebraic formulas.
A single number or letter is also an algebraic expression.
For example: 0, -9, 1.5, a, x, etc. are also algebraic expressions.
Can you list some algebraic expressions?
Note: There are no equal signs or inequality signs in algebraic expressions.
Several points to note when writing algebraic expressions.
(1) a×b is usually written as a·b or ab;
(2) When numbers and letters are multiplied, the numbers are usually written in front of the letters. If the number is a mixed number, it is usually converted into an improper fraction;
(3) 1÷a is usually written as 1/a( a≠0);
Do it
(1) The turnover of a supermarket in August was m million yuan. The turnover in September increased by 1/4 compared with August. How many million yuan was the turnover of the supermarket in September?
(2) As shown in the figure, the lengths of the three sides of a right triangle are a cm, b cm, and 5 cm respectively. What is its area? What is the height of the hypotenuse?
(3) Teacher Lin purchased a car using the installment payment method: a down payment of RMB a, and then monthly payments of RMB 1,500 until the payment is paid off. After x months, how much yuan will Teacher Lin pay in total?
Fill in and discuss
1. Apples cost a yuan/kg and oranges b yuan/kg. If you buy 5kg of apples and 8kg of oranges, you pay (5a+8b) yuan;
2. Xiao Ming takes every step am, and Xiao Liang takes every step b m. Xiao Ming and Xiao Liang walk towards each other from both ends of the bridge. Xiao Ming takes 5 steps and Xiao Liang takes 8 steps to meet each other. The length of the bridge is (5a+8b)m ;
3. A triangular prism and b hexagonal prism have a total of (5a+8b) faces.
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For more information about the PPT courseware "Algebraic Expressions and Integers and Their Addition and Subtraction", please click on the Algebraic Expressions ppt Integers and Their Addition and Subtraction ppt tag.
"Value of Algebraic Expressions" PPT courseware 6:
"Value of Algebraic Expressions" PPT Courseware 6 Review: 1. What is a monomial? An algebraic expression that only contains the product of numbers and letters is called a monomial. 2. How to determine the coefficient and degree of a monomial? The sum of the exponents of all letters in a monomial is called the degree of the monomial. 3. What...
"Value of Algebraic Expressions" PPT courseware 5:
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"Value of Algebraic Expressions" PPT courseware 4:
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