2. Решите уравнения.
a) 209 - ( ( 145 + х ) - 12 ) + 96 = 123;
б) 18 + ( 159 - y ) + 34 = 172.
a) 209 - ( ( 145 + х ) - 12 ) + 96 = 123;
б) 18 + ( 159 - y ) + 34 = 172.
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Answers & Comments
209-(145-12+x)=123-96
209-(133+x)=27
209-133-x=27
76-27=x
49=x
x=49
б) 18+(159-y)+34=172
18+34+159-172=y
39=y
y=39