=5^6(5^2+1)/2×5^7=
=(25+1)/2×5=26/10=2.6
Сократим дробь:
(a-4)²-(a-4)(a-4)+8a=(a-4)²-(a-4)²+8a=8a ---> 8*(-0.3)=-2.4
Z=3y-3x
y=z+3x\3
<span>x=3y-z\3</span>
-4y(y+2)+(y-5)^2 =-4y^2-8y+y^2-10y+25=-3y^2-18y+25
________________
2(a-3)^2-2a^2=2(a^2-6a+9)-2a^2=2a^2-12a+18-2a^2=-12a+18
3a²b(b+2a)²=3a²b(b²+4ab+4a²)=
3a²b³+12a³b²+12a⁴b