1) <span>6√2+5√18=</span>6<span>√2+5<span>√(2*9)=6√2+5*3√2=6√2+15√2=21√2</span></span>
<span><span>2) <span>5√75-2√27=<span>5√(25*3)-2√(3*9)=25<span>√3-6√3=19<span>√3</span></span></span></span></span></span><span><span><span><span><span><span>3) <span>√2+√50-√18=<span>√2+√(25*2)-√(2*9)=<span>√2+5√2-3√2=3<span>√2</span></span></span></span></span></span></span></span></span></span><span><span><span><span><span><span><span><span><span><span>4) <span>3√20+5√45-2√80=<span>3√(4*5)+5√(9*5)-2√(5*16)=<span>6√5+15√5-8√5=1<span>3√5</span></span></span></span></span></span></span></span></span></span></span></span></span></span><span><span><span><span><span><span><span><span><span><span><span><span><span><span>5) <span>2√48+√27+√12=<span>2√(16*3)+√(9*3)+√(3*4)=<span>8√3+3√3+2√3=13<span>√3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span>6) <span>(√3-1) (√3+1)= по формуле разность квадратов=3-1=2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span>Пишите, если что не так.</span>
Ответ:
∠1 = 153°, ∠2 = 27°, ∠3 = 27°, ∠4 = 153°,
∠5 = 71°, ∠6 = 109°, ∠7 = 109°, ∠8 = 71°
Объяснение:
∠1 = ∠4 = 153°, т.к. вертикальные
∠2 = 180° - ∠4 = 180° - 153° = 27°, т.к. смежные
∠2 = ∠3 = 27°, т.к. вертикальные
∠5 = ∠8 = 71°, т.к. вертикальные
∠7 = 180° - ∠8 = 180° - 71° = 109°, т.к. смежные
∠6 = ∠7 = 109°, т.к. вертикальные
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Y^2-25 и 16b^2-25c^2 соответственно