А-9/16а=5 1/4
16а-9/16а= 21/4
4(16а-9)=16а×21
64а-36=336а
64а-336а=36
-272а=36
а=- 36/272
а= - 9/68
1/200=0,005
9/200=0,045
21/200=0,105
201/200=1,005
А) b + 5 9\10 = 7 5\12
b=89\12-59\10
b=445\60-354\60
b=91\60
b=1 31\60
<span>б) 3,85 x (d - 4,02) = 8,47
</span>d-4.02=8.47:3.85
d-4.02=2.2
d=2.2+4.02
d=6.22