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Ad - bc = 40 x + a + x = 40 x = 20 6. - ab = 18 - x bc = x cd = 17 - x 18 - x + x + 17 - x = 30 35 - x = 30 x = 5.

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KimyM3maryma
1

Ad - bc = 40

x + a + x = 40

x = 20

6.

- ab = 18 - x

bc = x

cd = 17 - x 18 - x + x + 17 - x = 30 35 - x = 30 x = 5.