Найдите x в пропорциях:4/9=8x/45 6/7=10x/21 27/5x=9/16
1) 4*45=9*8x 180=72x x=180/72 2) 6*21=7*10x 126=70x x=126/70 3) 27*16=5x*9 432=45x x=432/45