12:4=6:2
6:3=2:1
12:4=18:6
вроде бы так
<span>1/51 и 1/68 = 1/(3*17) и 1/(4*17) = 4/204 и 3/208
5/36 и 7/54 = 5/(2*2*9) и 7/(2*3*9) = 15/108 и 14/108
9/35 и 11/42 = 9/(7*5) и 11/(7*6) = 54/210 и 55/210
4/49 и 5/63 = 4/(7*7) и 5/(7*9) = 36/441 и 35/441
15/98 и 13/72 = 15/(2*49) и 13/(2*36) = 540/3528 и 637/3528</span>
2618= 2 × 1000 + 6 × 100 + 1 × 10 + 8=2000+600+10+8=2618
4096 = 4 × 1000+ 9 × 10 + 6= 4000+90+6=4096
2I2*3/2-3/8I+3/4=2I3-3/8I+3/4=2I21/8I+3/4=21/4+3/4=24/4=6
1) 480:24*100=2000
2) 540:18*100=3000