|a| = √ 3^2+0^2+(-4)^2 = 5
А) 10√3-4√48-√75=10√3-4√(16*3)-√(25*3)=10√3-4√(4²*3)-√(5²*3)=10√3-4*4*√3-5√3=-11√3
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б) </span><span>(5√2-√18)√2 = ( 5√2- √(2*9)) √2 = (5√2 -3√2)*√2= 2√2*√2=4
в) </span>(3-√2)²=9-2*3*√2+√2²=9-6√2+4=13-6√2
sqrt(98)=7*sqrt(20 sqrt(8)=2*sqrt(2)
14*2-8=20
Ответ: 20
<span>(х+3)(х-10) < (х-5)(х-2)
х²-10х+3х-30 </span><span>< х²-2х-5х+10
х²-7х-30 </span><span>< х²-7х+10
-30 </span><span>< 10</span>
=1/x+2 -2/3x=2x+1/x -2/3x=6x^2+3x-2x/3x^2=6x^2+x/3x^2=2x^2+x