1) 4(2a - 3b)
2) 3(2a - 3b + 4c)
3) 5a(2b + 3a)
4) a2b3 (a2 + ab + b2)
5) 5ab(2m-2n)
6) 5ab * (m-n) + (-(n-m) = 5ab(2m-2n)
AD=√(AB²-(BC/2)²)=√(100-36)=√64=8см
S=1/2*AD*BC=1/2*8*12=48см²
BF=S/AC=48/10=4,8см
x~~0.073414 (3.89182-7. W_n(-0.346221)), n element Z
x = 1
<span>2(y-5)+3y=4(2y+8)
2y-10+3y=8y+32
5y-10=8y+32
5y-8y=32+10
-3y=42
y=-14</span>