No75 1) x:20=2:5; 5x=2-20; Sx=40; x=40:5; x=8;
2) x:18=7:9; 9x=7-18; 9x=126; x=126:9; x=14;
3) x:18=2:3; 3x=2-18; 3.x = 36; x= 36:3; x=12;
4) 6:x=3:7; 3x=6-7; 3x = 42; X=42:3; x=14;
5) 5:9=15:x; 5x=9-15; Sx=135; x=135:5; x=27;
6) 12:7=60:x; 12x = 7-60; 12x = 420; x=420:12; x= 39

Ragman007    1   14.09.2020 09:06    0