Упростите и найдите​

Question

Упростите и найдите​

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Answer 1

а) ＝( 4 - (-2) )/(4 + (-2)) ＝ 6/2 ＝ 3

b) ＝ (-2)/10 ＝ -0.2

c) ＝ 1/(13² - 12²) ＝ 1/(169 - 144) ＝ 1/25 ＝ 0.04

d) ＝ ( 2² + (-1)²)/ 2 * (-1) ＝ 5/(-2) ＝ -2.5

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