Ответ:
Объяснение:1.a)=5√2+2√(16·2)-√(49·2)=5√2+8√2-7√2=6√2.
б)=4(√3)²+√81=12+9=21.
в)=(√5)²-2√(5·3)+(√3)²=5-2√15 +3=8-2√15.
2. 1/2√28=√(28·1/4)=√7, 1/3√54=√(54·1/9)=√6;
√7>√6⇒ 1/2√28>1/3√54.
3. a)= √5(√2+√5) /(√2(√2+√5)) =√5/√2=√10/2.
б)= √x ·(√x-3) /( 2(√x-3)) =√x/2.
4. a)= 7√21 /2(√21)² =7√21/(2·21)=√21/6;
б) = 22(√13+√2)/((√13-√2)(√13+√2))=22(√13+√2)/(13-2) =22(√13+√2)/11=
2(√13+√2).
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Ответ:
Объяснение:1.a)=5√2+2√(16·2)-√(49·2)=5√2+8√2-7√2=6√2.
б)=4(√3)²+√81=12+9=21.
в)=(√5)²-2√(5·3)+(√3)²=5-2√15 +3=8-2√15.
2. 1/2√28=√(28·1/4)=√7, 1/3√54=√(54·1/9)=√6;
√7>√6⇒ 1/2√28>1/3√54.
3. a)= √5(√2+√5) /(√2(√2+√5)) =√5/√2=√10/2.
б)= √x ·(√x-3) /( 2(√x-3)) =√x/2.
4. a)= 7√21 /2(√21)² =7√21/(2·21)=√21/6;
б) = 22(√13+√2)/((√13-√2)(√13+√2))=22(√13+√2)/(13-2) =22(√13+√2)/11=
2(√13+√2).