Решить уравнение (9*10+49*10)+(5*x+40)=100*16+100*25

( 90 + 490) + 5x + 40 = 1600 + 2500580 + 5x + 40 = 41005x = 4100 - 6205x = 3480x = 3480 / 5x = 696Ответ: x = 696.

(9*10 + 49 * 10 ) + (5х+40)=100*16  + 100*25

(9+49)*10+5х+40 = 100*(16+25)

58*10 + 5х+40 = 4100

580+ 40 + 5х = 4100

620 + 5х = 4100

5х = 4100 - 620

5х= 3480

х= 3480 :5

х= 696