10. a = (14+1/16)-0.0025×25=225/16+0.0625=14.0625+0.0625=14.125
b = (4+1/4):0.85+1:0.5=(5/4):(17/20)+2=(5/4)×(20/17)+2=25/17+2=59/17
c = (4+1/8)-0.004×300=4.125-1.2=2.925
(a:b):0.2+c:0.015=[14.125:(59/17)]:0.2+2.925:0.015=(1921/472):0.2+195=9605/472 + 195=101645/472.
11. a = [6-(4+1/2)]:0.03=1.5:0.03=50
b = (0.3-3/20)×(1+1/2)=3/20 ×1.5=9/40=0.225
c = [(3+1/20)-2.65]×4+2/5 = (3.05-2.65)×4+0.4=2
d = [1.88+(2+3/25)]:80=(1.88+2.12):80=0.05
[a:c-10(b+10d)]:(2-1/10)=[25-10(0.225+10×0.05)]:1.9=(25-7.25):1.9=17.75:1.9=355/38
