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
<span>120+x*15=375
120+15x=375
15x=375-120
15x=255
x=255:15
x=17</span>
3 3/4 * 2/3 = 15/4 * 2/3 = 5/2 = 2 1/2
4 1/2 * 7/18 = 9/2 * 7/18 = 7/4 = 1 3/4
4 1/16 * 8/13 = 65/16 * 8/13 = 5/2 = 2 1/2