tolong dijawab pake cara

1.10-0,2x
2.a. a², ab, a, b
b. 4a², 5ab, -a, 2b
c. 12
d. -1+2=1
3.a=(-4)²-½(-4)+5=16+2+5=23
b=(3/4)²-½.¾+5=9/16-3/8+5=9-6+80 /16=83/16
a+b=23+5 3/16=28 3/16
4.a. 15p³qr²=3.5.p³.q.r²
6p²q²=2.3.p². q²
Kpk=2.3.5.p³q²r²=30p³q²r²
Fpb=3p²q
b. 6mn=2.3.m.n
4m²n=2².m².n
12mn²=2².3.m.n²
Kpk=2².3.m².n²=12m²n²
Fpb=2mn
5.4x-2-(x+3)=y
4x-x-2-3=y
y=3x-5
y=3.11-5=33-5=28