-(-5 3/14):2 1/7*1 5/14=73/14*7/15*19/14=73*1*19/2*15*14=1387/420=3 127/420
(a²/25-15b)²=a<span>^4/625-6a</span>²b/5+225b²
\\\\\\\\\\\\\\\\\\\\\\\\\
1)
0,16x^8-1,2x^4y+2,25y²=
=(0,4x^4-1,5y)²
2)
-0,9d^12 a^13 * 0,6 d^8 a^14=
=-0,54d^20 a^27
3)
(0,2 n^13 y^5)^4 =
=0,0016n^52 y^20