Question

Помогите решить номер 26 (2 столбик) , 28 (а), 45 (весь)

Answer 1

26
√3(6-2√3)=6√3-2(√3)²=6√3-2*3=6√3-6
√7(√3-√7)=√3*7-(√7)²=√21-7
-√2(√2-√3)=-2+√6
√6(√2-2√5)=√12-2√30=2√3-2√30
28
P=3√2+5√2+4√2=12√2
S=1/2*3√2*4√2=1/2*12*2=12
45
(2√5)²=4*5=20
(-0,5√9)²=0,25*9=2.25
(1/2√12)²=1/4*12=3
(-1,1√2 3/4)²=(-1,1√11/4)²=1,21*11/4=1331/400=3 131/400

Answer 2

26
б)√3(6-2√3)=6√3-2√3√3=6√3-2*3=6√3-6
г)√7(√3-√7)=√7√3-√7√7=√21-7
е)-√2(√2-√3)=-√2√2+√2√3=-2+√6=√6-2
з)√6(√2-2√5)=√6√2-2√6√5=√12-2√30=√(4*3)-√30=√4√3-√30=2√3-√30

28 а)Р=3√2+5√2+4√2=12√2
S=3√2*4√2/2=3*4*2/2=3*4=12

45
а)(2√5)²=2*2*√5√5=4*5=20
б)(-0,5√9)²=0,25*9=2,25
в)(1/2√12)²=1/4*12=3
г)(2/9√81)²=4/81*81=4
д)(-1,1√2  3/4)²=(-1 1/10√11/4)²=(-11/10√11/4)²=121/100*11/4=
=1331/400=3 131/400=3,3275