Решить уравнение (9*10+49*10)+(5*x+40)=100*16+100*25
(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
( 90 + 490) + 5x + 40 = 1600 + 2500 580 + 5x + 40 = 4100 5x = 4100 - 620 5x = 3480 x = 3480 / 5 x = 696 Ответ: x = 696.