1.6 * ( 18.8 + 1.2) + 2.4 * ( 18.8 - 1.2 ) = 1.6 * 20 + 2.4 * 17.6 = 32 + 42.24 =
= 74.24 ( km )
2) х²+у²+2ху–(х+у)³=(х+у)²–(х+у)³=(х+у)²(1-х-у);
4)(m+2n)³-m²+4n²=(m+2n)²-(m²-4n²)=(m+2n)²-(m-2n)(m+2n)=(m+2n)(m+2n-(m-2n))=(m+2n)(m+2n-m+2n)=(m+2n)•4n;
6)(x+3y)²-x³-9x²y-27xy²-27y³=(x+3y)²-(x+3y)³=(x+3y)²(1-x-3y)
8^10 - 8^9 - 8^8 = 8^8 * ( 8^2 - 8 - 1 ) = 8^8 * ( 64 - 9 ) = 8^8 * 55 =
= 8^8 * 5 * 11
18-3=15 Место + пишешь минус
A) V256=+-16.
б) V2,56=+-1,6.
в) V2560=+-50,596442562694...
<span>г) V(256/9)=+-16/3=+-5,(3).</span>