√0,07(1) = √(71-7)/900 = √64/900 = √64/√900 = 8/30 = 4/15
√1,13(7) = √(1137-113)/900 = √1024/900 = √1024/√900 = 32/30 = 16/15
0,4096 = 4096/10000 = 256/625
⇒ x/4/15 = 16/15/256/625
x×15/4 = 16/15×625/256
x×15/4 = 125/48
x = 125/48 : 15/4
x = 125/48×4/15
x = 25/36