"Addition and Subtraction of Integers" PPT on Integers and Their Addition and Subtraction (Lesson 1)

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"Addition and Subtraction of Integers" PPT on Integers and Their Addition and Subtraction (Lesson 1)

Part One Content: Basic Knowledge Key Points

2. If -x3ym and 2yx3 are similar terms, then the value of m is (B)

A.-1 B.1

C.2 D.3

Knowledge point 2: Merge similar items

4. Which of the following calculations is correct (D)

A.b-5b=-4 B.2m+n=2mn

C.2a4+4a2=6a6 D.-2a2b+5a2b=3a2b

5.The result of calculating 3a3-a3 is (C)

A.2 B.2a

C.2a3 D.3a3

PPT on addition and subtraction of integers, part 2: improvement of comprehensive abilities

9.Which of the following formulas is correct to calculate (B)

①a2+a2=a4;②3xy2-2xy2=1;③3ab-2ab=ab;④(-2)3-(-3)2=-17.

A.1 B.2 C.3 D.0

10. If x-y is regarded as a term, then combine 2(x-y)2+3(x-y)+5(y-x)2+3(y-x) to get (A)

A.7(x-y)2

B.-3(x-y)2

C.-3(x+y)2+6(x-y)

D.(y-x)2

11. If -xmy4 and 1/4x3yn are similar terms, then (m-n)4=1.

12. If the monomials 2xm+3y4 and -8x5y3n-1 are similar terms, then the sum of these two monomials is -6x5y4.

Addition and subtraction of integers PPT, the third part: Expansion, exploration and breakthrough

19. There is such a question: "Calculate the value of 3x2-2x+12-x-3x2-8+3x, where x=2019." Xiao Ming mistakenly copied "x=2019" into "x=2091", but his The calculation is also correct. Can you explain what is going on?

Solution: Because 3x2-2x+12-x-3x2-8+3x=(3-3)x2+(-2-1+3)x+12-8=4,

Therefore, the value of the original formula has nothing to do with the value of x, so his calculation result is also correct.

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For more information about the PPT courseware "Integers and their addition and subtraction of integers", please click the Integers and their addition and subtraction PPT Addition and subtraction of integers PPT tab.

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Update Time: 2024-10-01

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