Question

(720 : Х - 2) + 40 = 128
(4 х Х + 20) + 720 = 900
(Х х 5 + 25 ) - 415 = 60
900 - (4 х Х - 60) = 360
( 42 : Х - 7 ) х 30 = 420​

Answer 1

Ответ:

$\frac{720}{x } - 2+ 40 = 128 \\ \frac{720}{x -} = 90 \\ x = 8$

$4x + 20 + 720 = 900 \\ 4x = 160 \\ x = 160 \div 4 = 40$

$900 - 4x + 60 = 360 \\ 4x = 600 \\ x = 150$

$5x + 25 - 415 = 60 \\ 5x = 450 \\ x = 90$

$( \frac{42}{x} - 7)30 = 420 \\ \frac{42}{x} = 14 + 7 \\ x = \frac{42}{21} = 2$

Answer 2

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