A1.
3 ²/₃ + 0.25*4=3 ²/₃ + 1= 4 ²/₃
A2.
0.75*120=³/₄ * 120 =3*30=90
A3.
(4a-3)²=16a²-24a+9
A4.
b=V/(ac)
A5.
f³ * (f⁴)⁵=f³ * f²⁰=f²³
A6.
8(t-3b)-6(2b+t)=8t-24b-12b-6t=2t-36b
A7.
27a⁶b¹²
A8.
(d-c)(c+d)=(d-c)(d+c)=d² - c²=2.5² - 2²=6.25-4=2.25
A9.
(27*3)/3² = (3³ * 3)/3² =3⁴/3² =3² =9
A10.
(m+3n)/(m²+3mn) = (m+3n)/[m(m+3n)]= 1/m
A11.
(1-2x)/3 =4
1-2x=12
-2x=12-1
-2x=11
x= -5.5
A12.
A-1
Б-3
В-2