Question

Решите уравнения: х+(90+30)=180,(х+90)+30=180,(х+60)*5=500,5*х+300=500

Answer 1

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Answer 2

тут полностью, я только 1ю строчку не писала

Answer 3

х+(90+30)=180
x + 120 = 180
x = 180 - 120
x = 60
60 + (90 + 30) = 180
180 = 180

(x + 90) + 30 = 180
x = 180 - 90 - 30
x = 60
(60 + 90) + 30 = 180
180 = 180


(x + 60) *5 = 500
5x + 300 = 500
5x = 500 - 300
5x = 200
x = 200 : 5
x = 40
(40 + 60) * 5 = 500
500 = 500

5*x + 300 = 500
5x + 300 = 500
5x = 500 - 300
5x = 200
x = 200 :5 
x = 40
5 * 40 + 300 = 500
500=500