Ответ!!!!!!!!!!!!!!!!!!!!
1)10a²bc
2)21abyzd
3)0,25y³b²
4)0,75x³z²
5)(12/7*7/12)x^5=x^5
6)(9/10*10/9)z²x^4=z²x^4
(a-b)²=a²-2ab+b²
(a+b)²=a²+2ab+b²
a²-b²=(a-b)(a+b)
(11-√17)(11+√17)
=11²-(√17)²=121-17=104
<span>(√43-5)²+ 10(√43-0,2)=66
1) </span>(√43-5)²=(√43)² - 2*5*√43 + 5²=43-10√43+25=68<span>-10√43
2) </span><span><span>10(√43-0,2)=10</span></span><span>√43 - 10*0.2 =</span><span>10<span>√43-2</span>
3) </span><span>68<span>-10√43 +</span></span><span>10√43-2=68-2=66
14(1+√31)+(7-√31)²=94
1) </span><span>14(1+√31)=14+</span><span>14√31
2) </span><span><span>(7-√31)²=7² - 2*7*√31 + (²√31)</span>=49-14√43+31=80-14√43
3) </span><span><span>14+14√31</span>+</span><span><span>80-14√43=14+80=94
</span> (√2-√15)²+(√6+√5)²</span>=28
1) <span>(√2-√15)²=(√2)² - 2*√2*√15 + (√15)²=2-2√30+15=17-4√30
2) </span><span><span>(√6+√5)²=(√6)² + 2*√6*√5 </span>+ (√5)²=6+2√30+5=11+2√30
3) </span><span>17-2√30</span>+11+2√30=17+11=28
<span>-2(х-3)=-3(х+7)
-2х+6=-3х-21
-2х+3х=-21-6
х=-27
Ответ:-27 </span>
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