Three mark exercise problems IV — task. Mathematics State Board, Class 7.

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1. Find the unit digit of the numeric expression

$16^{23} + 71^{48} + 59^{61}$ .

Answer:

Unit digit

$=$

2. If

$X = 5x^2 + 7x + 8$ and

$Y = 4x^2 - 7x + 3$ , then find the degree of

$X + Y$ .

Answer:

Degree of

$X + Y =$

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