Ответ:
(5•a-25)/4 = 29 - 4•6
(5•a-25)/4 = 5
5•a = 45
a = 9
39+a (42/7) - (19+18) = 26
39+a•6-37=26
a•6=24
a=4
(470+430)/3-x/5=100
900/3-x/5=100
300-x/5=100
-x/5=-200
x=1000
7•x+(1270-30)/4=366
7•x+310=366
7•x=56
x=8
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Ответ:
(5•a-25)/4 = 29 - 4•6
(5•a-25)/4 = 5
5•a = 45
a = 9
39+a (42/7) - (19+18) = 26
39+a•6-37=26
a•6=24
a=4
(470+430)/3-x/5=100
900/3-x/5=100
300-x/5=100
-x/5=-200
x=1000
7•x+(1270-30)/4=366
7•x+310=366
7•x=56
x=8