Question

реши уравнение с проверкой : 200×(х+71)=5400; 900×16-900с=5400; 400×(х-12)=3600

Answer 1

1. 200×(x+71)=5400
X+71=27
X=27-71
X=-44
2.900×16-900c=540
14400-900c=540
-900c=540-14400
-900c=-13860
C=15,4
3.400×(x-12)=3600
X-12=9
X=9+12
X=21