Решите уравнения

1) (х-213) : (43+17) = 100

2) (2500+х) : (83+17) = 43

3) (х+17) : (25+957) = 57

4) (х+101) : (93+28) = 289

Эти уравнения решаются пропорцией.

1) (х-213) / (43+17) = 100

x-213 = 100 * (43 + 17)

x-231 = 100 * 60

x-231 = 6 000

x = 6 000+231

x = 6 231

2) (2 500+х) / (83+17) = 43

2 500+х = 43 * (83+17)

2 500+х = 43*100

2 500+х = 4 300

x = 4 300-2 500

x = 1 800

3) (х+17) / (25+957) = 57

х+17 = 57 * (25+957)

х+17 = 57*982

х+17 = 55 974

x = 55 974-17

x = 55 957

4) (х+101) / (93+28) = 289

х+101 = 289 * (93+28)

х+101 = 289*121

х+101 = 34 969

x = 34 969-101

x = 34 868