Log(16)42*log(7)8 - 3log(49)√6=(1+log(4)6)/4log(7)2 *3log(7)2-3/4*log(7)6=
=3/4*(1+log(4)6)-3/4*log(7)6=3/4+3/4*log(7)6-3/4*log(7)6=3/4
log(16)42=log(16)(7*6)=log(7)(7*6)/log(7)(2^4)=[log(7)7+log(7)6]/4log(7)2=(1+log(7)6)/4log(7)2
log(49)(6^1/2)=log(7)(6^1/4)=1/4*log(7)6
S=Пи D кв /4=3.14 * (2*2) кв /4=3.14*16 /4=3.14*4=12.56 см кв
<span> (d^18+s^18)^2−(d^18−s^18)^2−d^2s^2=
d</span>³⁶+2d¹⁸s¹⁸+s³⁶-d³⁶+2d¹⁸s¹⁸-s³⁶-d²s²=4d¹⁸s¹⁸-d²s²=d²s²(4d¹⁶s¹⁶-1)=
d²s²(2d⁸s⁸-1)(2d⁸s⁸+1)
( 4u × 2 + 3 ) × ( 3u - 6 ) × u5 = ( 8u + 3 ) × ( 3u - 6 ) × u5 = ( 8u + 3 ) × ( 3u - 6 ) × 5u = ( 40u² + 15u ) × ( 3u - 6 ) = 120u³ - 240u² + 45u² - 90u = 120u³ - 195u² - 90u