1,3*(5-6)-1.7*(4-5)=1,3*(-1)-1,7*(4-5)=-1,3-1,7=-3
Вот............... ответ 6
1)
8√3-5√12+4√75 = 8√3 - 5√(4*3) + 4√(25*3) =
= 8√3 - 5*2√3 + 4*5√3 = 8√3 - 10√3 + 20√3 = 18√3,
2)
(2√7+3)² = (2√7)² + 2 *2√7 *3 + 3² =
= 4*7 + 4√7 + 9 = 37 + 4√7,
3)
(7√2-3√3)(7√2+3√3) = (7√2)² - (3√3)² = 49*2 - 9*3 =
= 98 - 27 = 71
㏒6(㏒7()) + 9㏒8()=
㏒6(㏒7()) + 9㏒2^3()=
㏒6(1/6*㏒7(7)) + 9(4/3*3)㏒2(2)=㏒6(1/6*1) + 4*1=-1 + 4= 3
2)
3) log√3(5)*log25(6)*log6(27)=
log(5)*log(6)*log6()=
2*2*3log3(5)*log5(6)*log6(3)=12log3(5)*log5(6)*log6(3)=
12log3(5)*log5(6)*(log5(3)/log5(6))=12log3(5)*log5(3)=
12log3(5)*(1/log3(5))=12