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"Evaluation of Algebraic Expressions" Integers and their addition and subtraction PPT courseware 2
review
1. The units digit of a two-digit number is a and the tens digit is b. Please use an algebraic expression to express this two-digit number;
2. How to express a three-digit number using algebra?
3. What can the algebraic formula (1+8%)x represent?
4. Replace x in (1+8%)x with specific numerical values, and explain the meaning of the resulting algebraic expression value.
5. 11 times f plus 2 can be expressed as _____.
6. The sum of 1/8 of the number a and this number can be expressed as _____.
in conclusion:
As the value of n increases, the value of each algebraic expression increases.
The value of n2 first exceeds 100, because when n=6, the value of n2 begins to exceed the value of 5n+6.
The laws reflected by each algebraic expression can be inferred from the evaluation of algebraic expressions. Different algebraic expressions reflect different laws.
The mass of human blood accounts for about 6%-7.5% of body weight
(1) If a person weighs a kilogram, what is the approximate range of his blood mass?
(2) Liangliang weighs 40 kilograms. What is the approximate range of his blood quality?
(3) Estimate your own blood quality.
Summary: What did you gain from this lesson?
Recognizing that algebraic expressions can concisely express the relationship between numbers and quantities in life, we can infer the laws reflected in algebraic expressions based on the evaluation of algebraic expressions, thereby learning to judge things, estimate problems, and use algebraic knowledge to solve some simple problems.
The evaluation of an algebraic expression is to replace the letters in the algebraic expression with numerical values and calculate the result according to the algorithm.
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"Evaluation of Algebraic Expressions" Integers and their addition and subtraction PPT courseware 3:
"Evaluation of Algebraic Expressions" Integer expressions and their addition and subtraction PPT courseware 3 Expressed in algebra: (1) Three times the sum of x and 5 ________ (2) The number that is 1 more than the square of the difference between a and b is ___ (3 ) 5 times the sum of number A and half of number B _____ (4) A two-digit number, the number in the ones place is b ten..
"Evaluation of Algebraic Expressions" Integers and their addition and subtraction PPT courseware:
"Evaluation of Algebraic Expressions" PPT courseware on integers and their addition and subtraction. Do it: According to medical research, the mass of human blood accounts for about 6% to 7.5% of human body weight. ⑴If someone weighs a kilogram, what is the approximate range of his blood mass? ⑵Liangliang’s weight is 40..